diff --git a/config.h b/config.h
index 9014bfb..f011026 100644
--- a/config.h
+++ b/config.h
@@ -30,7 +30,7 @@ static const Rule rules[] = {
 	 *	WM_NAME(STRING) = title
 	 */
 	/* class      instance    title       tags mask     isfloating   monitor */
-	0
+	{ NULL,       NULL,       NULL,       0,            False,       -1 },
 };
 
 /* layout(s) */