diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index c75ddb849..3bdecce5d 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1574,7 +1574,7 @@ ngx_http_test_content_type(ngx_http_request_t *r, ngx_hash_t *types_hash)
         return (void *) 4;
     }
 
-    if (r->headers_out.content_type.len == 0) {
+    if (r->headers_out.content_type_len == 0) {
         return NULL;
     }