diff --git a/lib/nghttp2_frame.c b/lib/nghttp2_frame.c
index ebf2e5e6..3d057847 100644
--- a/lib/nghttp2_frame.c
+++ b/lib/nghttp2_frame.c
@@ -191,9 +191,7 @@ void nghttp2_frame_extension_init(nghttp2_extension *frame, uint8_t type,
   frame->payload = payload;
 }
 
-void nghttp2_frame_extension_free(nghttp2_extension *frame _U_) {
-  /* should be noop for performance reason */
-}
+void nghttp2_frame_extension_free(nghttp2_extension *frame _U_) {}
 
 size_t nghttp2_frame_priority_len(uint8_t flags) {
   if (flags & NGHTTP2_FLAG_PRIORITY) {