diff --git a/src/p_tick.cpp b/src/p_tick.cpp
index 820a4ff68..67bcc592d 100644
--- a/src/p_tick.cpp
+++ b/src/p_tick.cpp
@@ -40,6 +40,7 @@
 #include "p_spec.h"
 #include "g_levellocals.h"
 #include "events.h"
+#include "actorinlines.h"
 
 extern gamestate_t wipegamestate;