diff --git a/src/nsfns.m b/src/nsfns.m
index 89b9f7c4b62..9c805ac20d1 100644
--- a/src/nsfns.m
+++ b/src/nsfns.m
@@ -1009,7 +1009,7 @@ Turn the input menu (an NSMenu) into a lisp list for tracking on lisp side
       x_free_frame_resources (f);
       free_glyphs (f);
 
-#ifdef GLYPH_DEBUG
+#if defined GLYPH_DEBUG && defined ENABLE_CHECKING
       /* Check that reference counts are indeed correct.  */
       eassert (dpyinfo->terminal->image_cache->refcount == image_cache_refcount);
 #endif