diff --git a/src/p_effect.cpp b/src/p_effect.cpp
index 93724d9629..d6543b16e0 100644
--- a/src/p_effect.cpp
+++ b/src/p_effect.cpp
@@ -47,6 +47,7 @@
 #include "r_utility.h"
 #include "g_levellocals.h"
 #include "vm.h"
+#include "actorinlines.h"
 
 CVAR (Int, cl_rockettrails, 1, CVAR_ARCHIVE);
 CVAR (Bool, r_rail_smartspiral, 0, CVAR_ARCHIVE);