diff --git a/src/http/modules/ngx_http_charset_filter_module.c b/src/http/modules/ngx_http_charset_filter_module.c
index 459143a..8938055 100644
--- a/src/http/modules/ngx_http_charset_filter_module.c
+++ b/src/http/modules/ngx_http_charset_filter_module.c
@@ -1484,6 +1484,14 @@
     ngx_http_charset_recode_t     *recode;
     ngx_http_charset_main_conf_t  *mcf;
 
+    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
+                             prev->types_keys, &prev->types,
+                             ngx_http_charset_default_types)
+        != NGX_OK)
+    {
+        return NGX_CONF_ERROR;
+    }
+
     ngx_conf_merge_value(conf->override_charset, prev->override_charset, 0);
     ngx_conf_merge_value(conf->charset, prev->charset, NGX_HTTP_NO_CHARSET);
 
@@ -1523,14 +1531,6 @@
     recode->src = conf->source_charset;
     recode->dst = conf->charset;
 
-    if (ngx_http_merge_types(cf, conf->types_keys, &conf->types,
-                             prev->types_keys, &prev->types,
-                             ngx_http_charset_default_types)
-        != NGX_OK)
-    {
-        return NGX_CONF_ERROR;
-    }
-
     return NGX_CONF_OK;
 }
 
diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 024170f..9a826b0 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -1761,43 +1761,60 @@
 
 char *
 ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t *keys, ngx_hash_t *types_hash,
-    ngx_array_t *prev_keys, ngx_hash_t *prev_types_hash, 
+    ngx_array_t *prev_keys, ngx_hash_t *prev_types_hash,
     ngx_str_t *default_types)
 {
     ngx_hash_init_t  hash;
 
-    if (keys == NULL) {
+    if (keys) {
 
-        if (prev_keys) {
-            *types_hash = *prev_types_hash;
-            return NGX_CONF_OK;
+        hash.hash = types_hash;
+        hash.key = NULL;
+        hash.max_size = 2048;
+        hash.bucket_size = 64;
+        hash.name = "test_types_hash";
+        hash.pool = cf->pool;
+        hash.temp_pool = NULL;
+
+        if (ngx_hash_init(&hash, keys->elts, keys->nelts) != NGX_OK) {
+            return NGX_CONF_ERROR;
         }
 
-        if (ngx_http_set_default_types(cf, &keys, default_types)
-            != NGX_CONF_OK)
-        {
+        return NGX_CONF_OK;
+    }
+
+    if (prev_types_hash->buckets == NULL) {
+
+        if (prev_keys == NULL) {
+
+	    if (ngx_http_set_default_types(cf, &prev_keys, default_types)
+                != NGX_OK)
+            {
+		return NGX_CONF_ERROR;
+	    }
+        }
+
+        hash.hash = prev_types_hash;
+        hash.key = NULL;
+        hash.max_size = 2048;
+        hash.bucket_size = 64;
+        hash.name = "test_types_hash";
+        hash.pool = cf->pool;
+        hash.temp_pool = NULL;
+
+        if (ngx_hash_init(&hash, prev_keys->elts, prev_keys->nelts) != NGX_OK) {
             return NGX_CONF_ERROR;
         }
     }
 
-    hash.hash = types_hash;
-    hash.key = NULL;
-    hash.max_size = 2048;
-    hash.bucket_size = 64;
-    hash.name = "test_types_hash";
-    hash.pool = cf->pool;
-    hash.temp_pool = NULL;
-
-    if (ngx_hash_init(&hash, keys->elts, keys->nelts) != NGX_OK) {
-        return NGX_CONF_ERROR;
-    }
+    *types_hash = *prev_types_hash;
 
     return NGX_CONF_OK;
 
 }
 
 
-char *
+ngx_int_t
 ngx_http_set_default_types(ngx_conf_t *cf, ngx_array_t **types,
     ngx_str_t *default_type)
 {
@@ -1805,14 +1822,14 @@
 
     *types = ngx_array_create(cf->temp_pool, 1, sizeof(ngx_hash_key_t));
     if (*types == NULL) {
-        return NGX_CONF_ERROR;
+        return NGX_ERROR;
     }
 
     while (default_type->len) {
 
         type = ngx_array_push(*types);
         if (type == NULL) {
-            return NGX_CONF_ERROR;
+            return NGX_ERROR;
         }
 
         type->key = *default_type;
@@ -1823,5 +1840,5 @@
         default_type++;
     }
 
-    return NGX_CONF_OK;
+    return NGX_OK;
 }
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index afbc69d..762d85c 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -111,7 +111,7 @@
 char *ngx_http_merge_types(ngx_conf_t *cf, ngx_array_t *keys,
     ngx_hash_t *types_hash, ngx_array_t *prev_keys, ngx_hash_t *prev_types_hash,
     ngx_str_t *default_types);
-char *ngx_http_set_default_types(ngx_conf_t *cf, ngx_array_t **types,
+ngx_int_t ngx_http_set_default_types(ngx_conf_t *cf, ngx_array_t **types,
     ngx_str_t *default_type);