diff --git a/openbox/popup.c b/openbox/popup.c
index 031b1d49..88619e77 100644
--- a/openbox/popup.c
+++ b/openbox/popup.c
@@ -23,6 +23,7 @@
 #include "frame.h"
 #include "client.h"
 #include "stacking.h"
+#include "event.h"
 #include "screen.h"
 #include "render/render.h"
 #include "render/theme.h"