diff --git a/gdk/gdkvisual.c b/gdk/gdkvisual.c
index d580c6b82f..356ea19295 100644
--- a/gdk/gdkvisual.c
+++ b/gdk/gdkvisual.c
@@ -371,7 +371,6 @@ gdk_visual_get_pixel_details (GdkVisual *visual,
           m >>= 1;
         }
 
-      m = pixel_mask;
       while (m & 0x1)
         {
           p++;