diff --git a/dwm.c b/dwm.c
index f1d86b2..17b595a 100644
--- a/dwm.c
+++ b/dwm.c
@@ -211,6 +211,7 @@ static void tagmon(const Arg *arg);
 static void tile(Monitor *m);
 static void togglebar(const Arg *arg);
 static void togglefloating(const Arg *arg);
+static void togglefullscreen(const Arg *arg);
 static void toggletag(const Arg *arg);
 static void toggleview(const Arg *arg);
 static void unfocus(Client *c, int setfocus);
@@ -1735,6 +1736,12 @@ togglefloating(const Arg *arg)
 	arrange(selmon);
 }
 
+void togglefullscreen(const Arg *arg)
+{
+  if(selmon->sel)
+    setfullscreen(selmon->sel, !selmon->sel->isfullscreen);
+}
+
 void
 toggletag(const Arg *arg)
 {