diff --git a/src/xfns.c b/src/xfns.c
index 5ba4a78ac9d..9bc2f794849 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -4757,6 +4757,7 @@ unwind_create_frame (Lisp_Object frame)
       free_glyphs (f);
 #if defined GLYPH_DEBUG && defined ENABLE_CHECKING
       /* Check that reference counts are indeed correct.  */
+      struct x_display_info *dpyinfo = FRAME_DISPLAY_INFO (f);
       eassert (dpyinfo->reference_count == dpyinfo_refcount);
 #endif /* GLYPH_DEBUG && ENABLE_CHECKING */
       return Qt;