diff --git a/stepmania/src/RageUtil.cpp b/stepmania/src/RageUtil.cpp
index a86bb9a1e8..c553a48821 100644
--- a/stepmania/src/RageUtil.cpp
+++ b/stepmania/src/RageUtil.cpp
@@ -294,7 +294,7 @@ RString ConvertWstringToACP( wstring s )
 	return ret;
 }
 
-RString ConvertUTF8ToACP( RString s )
+RString ConvertUTF8ToACP( const RString &s )
 {
 	return ConvertWstringToACP( RStringToWstring(s) );
 }
diff --git a/stepmania/src/RageUtil.h b/stepmania/src/RageUtil.h
index 319400c29f..4439edabbe 100644
--- a/stepmania/src/RageUtil.h
+++ b/stepmania/src/RageUtil.h
@@ -249,7 +249,7 @@ RString vssprintf( const char *fmt, va_list argList );
 RString hr_ssprintf( int hr, const char *fmt, ...);
 RString werr_ssprintf( int err, const char *fmt, ...);
 RString ConvertWstringToACP( wstring s );
-RString ConvertUTF8ToACP( RString s );
+RString ConvertUTF8ToACP( const RString &s );
 #endif
 
 /*