diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 0e6bb1d..f854549 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -1823,7 +1823,7 @@
     hash.hash = &conf->upstream.hide_headers_hash;
     hash.key = ngx_hash_key_lc;
     hash.max_size = 512;
-    hash.bucket_size = 64;
+    hash.bucket_size = ngx_align(64, ngx_cacheline_size);
     hash.name = "proxy_hide_headers_hash";
     hash.pool = cf->pool;
     hash.temp_pool = NULL;