diff --git a/stepmania/src/RadarValues.cpp b/stepmania/src/RadarValues.cpp
index 8f1818c6a1..881344c0f9 100644
--- a/stepmania/src/RadarValues.cpp
+++ b/stepmania/src/RadarValues.cpp
@@ -94,7 +94,7 @@ void RadarValues::FromString( RString sRadarValues )
 class LunaRadarValues: public Luna<RadarValues>
 {
 public:
-	static int GetValue( T* p, lua_State *L ) { lua_pushnumber( L, (*p)[IArg(1)] ); return 1; }
+	static int GetValue( T* p, lua_State *L ) { lua_pushnumber( L, (*p)[Enum::Check<RadarCategory>(L, 1)] ); return 1; }
 
 	LunaRadarValues()
 	{