--- a/gfx/cairo/libpixman/src/pixman-image.c
+++ b/gfx/cairo/libpixman/src/pixman-image.c
@@ -395,17 +395,17 @@ pixman_image_set_transform (pixman_image
     
     image_common_t *common = (image_common_t *)image;
 
     if (common->transform == transform)
 	return TRUE;
 
     if (memcmp (&id, transform, sizeof (pixman_transform_t)) == 0)
     {
-	transform = NULL;
+	common->transform = NULL;
 	return TRUE;
     }
     
     if (common->transform)
 	free (common->transform);
 
     if (transform)
     {