diff --git a/dwm.c b/dwm.c
index 9bad2af..5feb864 100644
--- a/dwm.c
+++ b/dwm.c
@@ -2899,6 +2899,9 @@ swapmon(const Arg *arg)
     m2->stack = tmp_stack;
 
     focus(NULL);
+}
+
+void
 swapwindow(const Arg *arg)
 {
     if (!selmon || !selmon->sel || !mons->next)