diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index 75972dc1f12..7ad4626a3bd 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -273,6 +273,7 @@ function page_set_cache() {
           $data = gzencode($data, FORCE_GZIP);
         }
       }
+      ob_end_flush();
       cache_set($base_url . request_uri(), $data, CACHE_TEMPORARY, drupal_get_headers());
     }
   }