diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 8278d34..afadc18 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -359,20 +359,20 @@
 static ngx_http_variable_t  ngx_http_proxy_vars[] = {
 
     { ngx_string("proxy_host"), ngx_http_proxy_host_variable, 0,
-      NGX_HTTP_VAR_CHANGABLE, 0 },
+      NGX_HTTP_VAR_CHANGABLE|NGX_HTTP_VAR_NOHASH, 0 },
 
     { ngx_string("proxy_port"), ngx_http_proxy_port_variable, 0,
-      NGX_HTTP_VAR_CHANGABLE, 0 },
+      NGX_HTTP_VAR_CHANGABLE|NGX_HTTP_VAR_NOHASH, 0 },
 
     { ngx_string("proxy_add_x_forwarded_for"),
-      ngx_http_proxy_add_x_forwarded_for_variable, 0, 0, 0 },
+      ngx_http_proxy_add_x_forwarded_for_variable, 0, NGX_HTTP_VAR_NOHASH, 0 },
 
 #if 0
-    { ngx_string("proxy_add_via"), NULL, 0, 0, 0 },
+    { ngx_string("proxy_add_via"), NULL, 0, NGX_HTTP_VAR_NOHASH, 0 },
 #endif
 
     { ngx_string("proxy_internal_body_length"),
-      ngx_http_proxy_internal_body_length_variable, 0, 0, 0 },
+      ngx_http_proxy_internal_body_length_variable, 0, NGX_HTTP_VAR_NOHASH, 0 },
 
     { ngx_null_string, NULL, 0, 0, 0 }
 };