diff --git a/stepmania/src/GameState.cpp b/stepmania/src/GameState.cpp
index 979df99ccf..79d901455d 100644
--- a/stepmania/src/GameState.cpp
+++ b/stepmania/src/GameState.cpp
@@ -27,6 +27,7 @@
 #include "GameConstantsAndTypes.h"
 #include "StepMania.h"
 #include "CommonMetrics.h"
+#include "Actor.h"
 
 #include <ctime>
 #include <set>