diff --git a/gdk-pixbuf/io-xbm.c b/gdk-pixbuf/io-xbm.c
index 46653b9..e61a01c 100644
--- a/gdk-pixbuf/io-xbm.c
+++ b/gdk-pixbuf/io-xbm.c
@@ -220,7 +220,7 @@ read_bitmap_file_data (FILE    *fstream,
 		if (strcmp ("bits[]", type))
 			continue;
     
-		if (!ww || !hh)
+		if (!ww || !hh || ww > (G_MAXINT >> 1) || hh > (G_MAXINT >> 1))
 			RETURN (FALSE);
 
 		if ((ww % 16) && ((ww % 16) < 9) && version10p)