diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
index aa2dcd7..39e9cd0 100644
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -2352,6 +2352,7 @@
      *     conf->upstream.bufs.num = 0;
      *     conf->upstream.ignore_headers = 0;
      *     conf->upstream.next_upstream = 0;
+     *     conf->upstream.cache_zone = NULL;
      *     conf->upstream.cache_use_stale = 0;
      *     conf->upstream.cache_methods = 0;
      *     conf->upstream.temp_path = NULL;
@@ -2390,7 +2391,7 @@
     conf->upstream.pass_request_body = NGX_CONF_UNSET;
 
 #if (NGX_HTTP_CACHE)
-    conf->upstream.cache = NGX_CONF_UNSET_PTR;
+    conf->upstream.cache = NGX_CONF_UNSET;
     conf->upstream.cache_min_uses = NGX_CONF_UNSET_UINT;
     conf->upstream.cache_bypass = NGX_CONF_UNSET_PTR;
     conf->upstream.no_cache = NGX_CONF_UNSET_PTR;
@@ -2435,12 +2436,10 @@
 #if (NGX_HTTP_CACHE)
 
     if (conf->upstream.store > 0) {
-        conf->upstream.cache = NULL;
+        conf->upstream.cache = 0;
     }
 
-    if (conf->upstream.cache != NGX_CONF_UNSET_PTR
-        && conf->upstream.cache != NULL)
-    {
+    if (conf->upstream.cache > 0) {
         conf->upstream.store = 0;
     }
 
@@ -2613,13 +2612,17 @@
 
 #if (NGX_HTTP_CACHE)
 
-    ngx_conf_merge_ptr_value(conf->upstream.cache,
-                              prev->upstream.cache, NULL);
+    if (conf->upstream.cache == NGX_CONF_UNSET) {
+        ngx_conf_merge_value(conf->upstream.cache,
+                              prev->upstream.cache, 0);
 
-    if (conf->upstream.cache && conf->upstream.cache->data == NULL) {
+        conf->upstream.cache_zone = prev->upstream.cache_zone;
+    }
+
+    if (conf->upstream.cache_zone && conf->upstream.cache_zone->data == NULL) {
         ngx_shm_zone_t  *shm_zone;
 
-        shm_zone = conf->upstream.cache;
+        shm_zone = conf->upstream.cache_zone;
 
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "\"fastcgi_cache\" zone \"%V\" is unknown",
@@ -3230,13 +3233,9 @@
     }
 
 #if (NGX_HTTP_CACHE)
-
-    if (flcf->upstream.cache != NGX_CONF_UNSET_PTR
-        && flcf->upstream.cache != NULL)
-    {
+    if (flcf->upstream.cache > 0) {
         return "is incompatible with \"fastcgi_cache\"";
     }
-
 #endif
 
     flcf->upstream.store = 1;
@@ -3277,12 +3276,12 @@
 
     value = cf->args->elts;
 
-    if (flcf->upstream.cache != NGX_CONF_UNSET_PTR) {
+    if (flcf->upstream.cache != NGX_CONF_UNSET) {
         return "is duplicate";
     }
 
     if (ngx_strcmp(value[1].data, "off") == 0) {
-        flcf->upstream.cache = NULL;
+        flcf->upstream.cache = 0;
         return NGX_CONF_OK;
     }
 
@@ -3290,9 +3289,11 @@
         return "is incompatible with \"fastcgi_store\"";
     }
 
-    flcf->upstream.cache = ngx_shared_memory_add(cf, &value[1], 0,
-                                                 &ngx_http_fastcgi_module);
-    if (flcf->upstream.cache == NULL) {
+    flcf->upstream.cache = 1;
+
+    flcf->upstream.cache_zone = ngx_shared_memory_add(cf, &value[1], 0,
+                                                      &ngx_http_fastcgi_module);
+    if (flcf->upstream.cache_zone == NULL) {
         return NGX_CONF_ERROR;
     }
 
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 69a704c..a3985b9 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -2509,6 +2509,7 @@
      *     conf->upstream.bufs.num = 0;
      *     conf->upstream.ignore_headers = 0;
      *     conf->upstream.next_upstream = 0;
+     *     conf->upstream.cache_zone = NULL;
      *     conf->upstream.cache_use_stale = 0;
      *     conf->upstream.cache_methods = 0;
      *     conf->upstream.temp_path = NULL;
@@ -2566,7 +2567,7 @@
     conf->upstream.pass_request_body = NGX_CONF_UNSET;
 
 #if (NGX_HTTP_CACHE)
-    conf->upstream.cache = NGX_CONF_UNSET_PTR;
+    conf->upstream.cache = NGX_CONF_UNSET;
     conf->upstream.cache_min_uses = NGX_CONF_UNSET_UINT;
     conf->upstream.cache_bypass = NGX_CONF_UNSET_PTR;
     conf->upstream.no_cache = NGX_CONF_UNSET_PTR;
@@ -2627,12 +2628,10 @@
 #if (NGX_HTTP_CACHE)
 
     if (conf->upstream.store > 0) {
-        conf->upstream.cache = NULL;
+        conf->upstream.cache = 0;
     }
 
-    if (conf->upstream.cache != NGX_CONF_UNSET_PTR
-        && conf->upstream.cache != NULL)
-    {
+    if (conf->upstream.cache > 0) {
         conf->upstream.store = 0;
     }
 
@@ -2804,13 +2803,17 @@
 
 #if (NGX_HTTP_CACHE)
 
-    ngx_conf_merge_ptr_value(conf->upstream.cache,
-                              prev->upstream.cache, NULL);
+    if (conf->upstream.cache == NGX_CONF_UNSET) {
+        ngx_conf_merge_value(conf->upstream.cache,
+                              prev->upstream.cache, 0);
 
-    if (conf->upstream.cache && conf->upstream.cache->data == NULL) {
+        conf->upstream.cache_zone = prev->upstream.cache_zone;
+    }
+
+    if (conf->upstream.cache_zone && conf->upstream.cache_zone->data == NULL) {
         ngx_shm_zone_t  *shm_zone;
 
-        shm_zone = conf->upstream.cache;
+        shm_zone = conf->upstream.cache_zone;
 
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "\"proxy_cache\" zone \"%V\" is unknown",
@@ -3818,13 +3821,9 @@
     }
 
 #if (NGX_HTTP_CACHE)
-
-    if (plcf->upstream.cache != NGX_CONF_UNSET_PTR
-        && plcf->upstream.cache != NULL)
-    {
+    if (plcf->upstream.cache > 0) {
         return "is incompatible with \"proxy_cache\"";
     }
-
 #endif
 
     plcf->upstream.store = 1;
@@ -3865,12 +3864,12 @@
 
     value = cf->args->elts;
 
-    if (plcf->upstream.cache != NGX_CONF_UNSET_PTR) {
+    if (plcf->upstream.cache != NGX_CONF_UNSET) {
         return "is duplicate";
     }
 
     if (ngx_strcmp(value[1].data, "off") == 0) {
-        plcf->upstream.cache = NULL;
+        plcf->upstream.cache = 0;
         return NGX_CONF_OK;
     }
 
@@ -3878,9 +3877,11 @@
         return "is incompatible with \"proxy_store\"";
     }
 
-    plcf->upstream.cache = ngx_shared_memory_add(cf, &value[1], 0,
-                                                 &ngx_http_proxy_module);
-    if (plcf->upstream.cache == NULL) {
+    plcf->upstream.cache = 1;
+
+    plcf->upstream.cache_zone = ngx_shared_memory_add(cf, &value[1], 0,
+                                                      &ngx_http_proxy_module);
+    if (plcf->upstream.cache_zone == NULL) {
         return NGX_CONF_ERROR;
     }
 
diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
index fed916a..845fcb4 100644
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -1148,7 +1148,7 @@
     conf->upstream.pass_request_body = NGX_CONF_UNSET;
 
 #if (NGX_HTTP_CACHE)
-    conf->upstream.cache = NGX_CONF_UNSET_PTR;
+    conf->upstream.cache = NGX_CONF_UNSET;
     conf->upstream.cache_min_uses = NGX_CONF_UNSET_UINT;
     conf->upstream.cache_bypass = NGX_CONF_UNSET_PTR;
     conf->upstream.no_cache = NGX_CONF_UNSET_PTR;
@@ -1189,12 +1189,10 @@
 #if (NGX_HTTP_CACHE)
 
     if (conf->upstream.store > 0) {
-        conf->upstream.cache = NULL;
+        conf->upstream.cache = 0;
     }
 
-    if (conf->upstream.cache != NGX_CONF_UNSET_PTR
-        && conf->upstream.cache != NULL)
-    {
+    if (conf->upstream.cache > 0) {
         conf->upstream.store = 0;
     }
 
@@ -1366,13 +1364,17 @@
 
 #if (NGX_HTTP_CACHE)
 
-    ngx_conf_merge_ptr_value(conf->upstream.cache,
-                              prev->upstream.cache, NULL);
+    if (conf->upstream.cache == NGX_CONF_UNSET) {
+        ngx_conf_merge_value(conf->upstream.cache,
+                              prev->upstream.cache, 0);
 
-    if (conf->upstream.cache && conf->upstream.cache->data == NULL) {
+        conf->upstream.cache_zone = prev->upstream.cache_zone;
+    }
+
+    if (conf->upstream.cache_zone && conf->upstream.cache_zone->data == NULL) {
         ngx_shm_zone_t  *shm_zone;
 
-        shm_zone = conf->upstream.cache;
+        shm_zone = conf->upstream.cache_zone;
 
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "\"scgi_cache\" zone \"%V\" is unknown",
@@ -1784,13 +1786,9 @@
     }
 
 #if (NGX_HTTP_CACHE)
-
-    if (scf->upstream.cache != NGX_CONF_UNSET_PTR
-        && scf->upstream.cache != NULL)
-    {
+    if (scf->upstream.cache > 0) {
         return "is incompatible with \"scgi_cache\"";
     }
-
 #endif
 
     scf->upstream.store = 1;
@@ -1831,12 +1829,12 @@
 
     value = cf->args->elts;
 
-    if (scf->upstream.cache != NGX_CONF_UNSET_PTR) {
+    if (scf->upstream.cache != NGX_CONF_UNSET) {
         return "is duplicate";
     }
 
     if (ngx_strcmp(value[1].data, "off") == 0) {
-        scf->upstream.cache = NULL;
+        scf->upstream.cache = 0;
         return NGX_CONF_OK;
     }
 
@@ -1844,9 +1842,11 @@
         return "is incompatible with \"scgi_store\"";
     }
 
-    scf->upstream.cache = ngx_shared_memory_add(cf, &value[1], 0,
-                                                &ngx_http_scgi_module);
-    if (scf->upstream.cache == NULL) {
+    scf->upstream.cache = 1;
+
+    scf->upstream.cache_zone = ngx_shared_memory_add(cf, &value[1], 0,
+                                                     &ngx_http_scgi_module);
+    if (scf->upstream.cache_zone == NULL) {
         return NGX_CONF_ERROR;
     }
 
diff --git a/src/http/modules/ngx_http_uwsgi_module.c b/src/http/modules/ngx_http_uwsgi_module.c
index 85db422..a8e2ef2 100644
--- a/src/http/modules/ngx_http_uwsgi_module.c
+++ b/src/http/modules/ngx_http_uwsgi_module.c
@@ -1354,7 +1354,7 @@
     conf->upstream.pass_request_body = NGX_CONF_UNSET;
 
 #if (NGX_HTTP_CACHE)
-    conf->upstream.cache = NGX_CONF_UNSET_PTR;
+    conf->upstream.cache = NGX_CONF_UNSET;
     conf->upstream.cache_min_uses = NGX_CONF_UNSET_UINT;
     conf->upstream.cache_bypass = NGX_CONF_UNSET_PTR;
     conf->upstream.no_cache = NGX_CONF_UNSET_PTR;
@@ -1403,12 +1403,10 @@
 #if (NGX_HTTP_CACHE)
 
     if (conf->upstream.store > 0) {
-        conf->upstream.cache = NULL;
+        conf->upstream.cache = 0;
     }
 
-    if (conf->upstream.cache != NGX_CONF_UNSET_PTR
-        && conf->upstream.cache != NULL)
-    {
+    if (conf->upstream.cache > 0) {
         conf->upstream.store = 0;
     }
 
@@ -1580,13 +1578,17 @@
 
 #if (NGX_HTTP_CACHE)
 
-    ngx_conf_merge_ptr_value(conf->upstream.cache,
-                              prev->upstream.cache, NULL);
+    if (conf->upstream.cache == NGX_CONF_UNSET) {
+        ngx_conf_merge_value(conf->upstream.cache,
+                              prev->upstream.cache, 0);
 
-    if (conf->upstream.cache && conf->upstream.cache->data == NULL) {
+        conf->upstream.cache_zone = prev->upstream.cache_zone;
+    }
+
+    if (conf->upstream.cache_zone && conf->upstream.cache_zone->data == NULL) {
         ngx_shm_zone_t  *shm_zone;
 
-        shm_zone = conf->upstream.cache;
+        shm_zone = conf->upstream.cache_zone;
 
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "\"uwsgi_cache\" zone \"%V\" is unknown",
@@ -2072,9 +2074,7 @@
 
 #if (NGX_HTTP_CACHE)
 
-    if (uwcf->upstream.cache != NGX_CONF_UNSET_PTR
-        && uwcf->upstream.cache != NULL)
-    {
+    if (uwcf->upstream.cache > 0) {
         return "is incompatible with \"uwsgi_cache\"";
     }
 
@@ -2118,12 +2118,12 @@
 
     value = cf->args->elts;
 
-    if (uwcf->upstream.cache != NGX_CONF_UNSET_PTR) {
+    if (uwcf->upstream.cache != NGX_CONF_UNSET) {
         return "is duplicate";
     }
 
     if (ngx_strcmp(value[1].data, "off") == 0) {
-        uwcf->upstream.cache = NULL;
+        uwcf->upstream.cache = 0;
         return NGX_CONF_OK;
     }
 
@@ -2131,9 +2131,11 @@
         return "is incompatible with \"uwsgi_store\"";
     }
 
-    uwcf->upstream.cache = ngx_shared_memory_add(cf, &value[1], 0,
-                                                 &ngx_http_uwsgi_module);
-    if (uwcf->upstream.cache == NULL) {
+    uwcf->upstream.cache = 1;
+
+    uwcf->upstream.cache_zone = ngx_shared_memory_add(cf, &value[1], 0,
+                                                      &ngx_http_uwsgi_module);
+    if (uwcf->upstream.cache_zone == NULL) {
         return NGX_CONF_ERROR;
     }
 
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 0693f05..b2066a3 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -780,7 +780,7 @@
 
         c->min_uses = u->conf->cache_min_uses;
         c->body_start = u->conf->buffer_size;
-        c->file_cache = u->conf->cache->data;
+        c->file_cache = u->conf->cache_zone->data;
 
         c->lock = u->conf->cache_lock;
         c->lock_timeout = u->conf->cache_lock_timeout;
@@ -2538,7 +2538,7 @@
 
             r->cache->min_uses = u->conf->cache_min_uses;
             r->cache->body_start = u->conf->buffer_size;
-            r->cache->file_cache = u->conf->cache->data;
+            r->cache->file_cache = u->conf->cache_zone->data;
 
             if (ngx_http_file_cache_create(r) != NGX_OK) {
                 ngx_http_upstream_finalize_request(r, u, NGX_ERROR);
@@ -5545,7 +5545,7 @@
 
         if (conf->hide_headers_hash.buckets
 #if (NGX_HTTP_CACHE)
-            && ((conf->cache == NULL) == (prev->cache == NULL))
+            && ((conf->cache == 0) == (prev->cache == 0))
 #endif
            )
         {
diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
index d04b669..23db15a 100644
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h
@@ -175,7 +175,7 @@
     ngx_http_upstream_local_t       *local;
 
 #if (NGX_HTTP_CACHE)
-    ngx_shm_zone_t                  *cache;
+    ngx_shm_zone_t                  *cache_zone;
 
     ngx_uint_t                       cache_min_uses;
     ngx_uint_t                       cache_use_stale;
@@ -195,6 +195,9 @@
     ngx_array_t                     *store_lengths;
     ngx_array_t                     *store_values;
 
+#if (NGX_HTTP_CACHE)
+    signed                           cache:2;
+#endif
     signed                           store:2;
     unsigned                         intercept_404:1;
     unsigned                         change_buffering:1;