1 files changed, 1 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 75466a787c7..5f08cd07d81 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -3769,7 +3769,7 @@ mark_image (img)
 {
   mark_object (&img->spec);
   
-  if (!NILP (img->data.lisp_val))
+  if (!GC_NILP (img->data.lisp_val))
     mark_object (&img->data.lisp_val);
 }