diff --git a/src/strings_func.h b/src/strings_func.h
--- a/src/strings_func.h
+++ b/src/strings_func.h
@@ -137,7 +137,7 @@ extern StringParameters _global_string_p
 
 char *InlineString(char *buf, StringID string);
 char *GetString(char *buffr, StringID string, const char *last);
-char *GetStringWithArgs(char *buffr, uint string, StringParameters *args, const char *last);
+char *GetStringWithArgs(char *buffr, StringID string, StringParameters *args, const char *last, uint case_index = 0);
 const char *GetStringPtr(StringID string);
 
 void InjectDParam(uint amount);