diff --git a/src/playsim/mapthinkers/a_quake.cpp b/src/playsim/mapthinkers/a_quake.cpp
index 6cb82cd3e..aae1061bf 100644
--- a/src/playsim/mapthinkers/a_quake.cpp
+++ b/src/playsim/mapthinkers/a_quake.cpp
@@ -33,6 +33,7 @@
 #include "d_player.h"
 #include "r_utility.h"
 #include "g_levellocals.h"
+#include "actorinlines.h"
 #include <p_maputl.h>
 
 static FRandom pr_quake ("Quake");