diff --git a/config/dwm/config.def.h b/config/dwm/config.def.h
index 4ce4d4da..bd6a1829 100644
--- a/config/dwm/config.def.h
+++ b/config/dwm/config.def.h
@@ -89,7 +89,7 @@ static const char *termcmd[]  = { "kitty", NULL };
 // audio
 static const char *upvol[]      = { "/usr/bin/pactl",   "set-sink-volume", "0",      "+5%",      NULL };
 static const char *downvol[]    = { "/usr/bin/pactl",   "set-sink-volume", "0",      "-5%",      NULL };
-static const char *mutevol[]    = { "/usr/bin/pactl",   "set-sink-mute",   "0",      "toggle", 
+static const char *mutevol[]    = { "/usr/bin/pactl",   "set-sink-mute",   "0",      "toggle",   NULL }; 
 
 static const Key keys[] = {
 	/* modifier                     key        function        argument */