diff --git a/openbox/actions/if.c b/openbox/actions/if.c
index 0b9f842a..a5d5f0bb 100644
--- a/openbox/actions/if.c
+++ b/openbox/actions/if.c
@@ -3,6 +3,7 @@
 #include "openbox/client.h"
 #include "openbox/frame.h"
 #include "openbox/screen.h"
+#include "openbox/focus.h"
 #include <glib.h>
 
 typedef struct {