--- a/src/murrine_style.c
+++ b/src/murrine_style.c
@@ -55,7 +55,7 @@
 
 #define SANITIZE_SIZE \
        g_return_if_fail (width  >= -1); \
-       g_return_if_fail (height >= -1); \
+       if (height < -1) return; \
        \
        if ((width == -1) && (height == -1)) \
                gdk_drawable_get_size (window, &width, &height); \