diff --git a/stepmania/src/LuaManager.cpp b/stepmania/src/LuaManager.cpp
index f3e3b7c428..9dd91cce87 100644
--- a/stepmania/src/LuaManager.cpp
+++ b/stepmania/src/LuaManager.cpp
@@ -456,13 +456,6 @@ XNode *LuaHelpers::GetLuaInformation()
 }
 	
 
-void LuaHelpers::PrepareExpression( RString &sInOut )
-{
-	// Remove unary +, eg. "+50"; Lua doesn't support that.
-	if( sInOut.size() >= 1 && sInOut[0] == '+' )
-		sInOut.erase( 0, 1 );
-}
-
 bool LuaHelpers::RunScriptFile( const RString &sFile )
 {
 	RString sScript;
diff --git a/stepmania/src/LuaManager.h b/stepmania/src/LuaManager.h
index 5d6614849e..e102752b22 100644
--- a/stepmania/src/LuaManager.h
+++ b/stepmania/src/LuaManager.h
@@ -61,9 +61,6 @@ namespace LuaHelpers
 
 	bool RunScriptFile( const RString &sFile );
 
-	/* Strip "//" comments and "+". */
-	void PrepareExpression( RString &sInOut );
-
 	/* Create a Lua array (a table with indices starting at 1) of the given vector,
 	 * and push it on the stack. */
 	void CreateTableFromArrayB( Lua *L, const vector<bool> &aIn );
diff --git a/stepmania/src/ThemeManager.cpp b/stepmania/src/ThemeManager.cpp
index 2fbc4da010..6423793931 100644
--- a/stepmania/src/ThemeManager.cpp
+++ b/stepmania/src/ThemeManager.cpp
@@ -957,7 +957,10 @@ void ThemeManager::PushMetric( Lua *L, const RString &sClassName, const RString
 	}
 	else
 	{
-		LuaHelpers::PrepareExpression( sValue );
+		// Remove unary +, eg. "+50"; Lua doesn't support that.
+		if( sValue.size() >= 1 && sValue[0] == '+' )
+			sValue.erase( 0, 1 );
+
 		LuaHelpers::RunExpression( L, sValue, sName );
 	}
 }