diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 5f48a0c82..f0aadb402 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -2342,7 +2342,9 @@ ngx_http_proxy_merge_headers(ngx_conf_t *cf, ngx_http_proxy_loc_conf_t *conf,
         conf->headers_source = prev->headers_source;
     }
 
-    if (conf->headers_set_hash.buckets) {
+    if (conf->headers_set_hash.buckets
+        && ((conf->upstream.cache == NULL) == (prev->upstream.cache == NULL)))
+    {
         return NGX_OK;
     }
 
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 747084528..87df57169 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -4085,7 +4085,9 @@ ngx_http_upstream_hide_headers_hash(ngx_conf_t *cf,
     {
         conf->hide_headers_hash = prev->hide_headers_hash;
 
-        if (conf->hide_headers_hash.buckets) {
+        if (conf->hide_headers_hash.buckets
+            && ((conf->cache == NULL) == (prev->cache == NULL)))
+        {
             return NGX_OK;
         }