diff --git a/stepmania/src/ThemeMetric.h b/stepmania/src/ThemeMetric.h
index 97e31d793c..4e81337bae 100644
--- a/stepmania/src/ThemeMetric.h
+++ b/stepmania/src/ThemeMetric.h
@@ -6,6 +6,7 @@
 #include "ThemeManager.h"
 #include <map>
 #include "Foreach.h"
+#include "LuaManager.h"
 
 class IThemeMetric
 {