diff --git a/newgrf_text.h b/newgrf_text.h
--- a/newgrf_text.h
+++ b/newgrf_text.h
@@ -8,7 +8,7 @@
 
 StringID AddGRFString(uint32 grfid, uint16 stringid, byte langid, bool new_scheme, const char *text_to_add, StringID def_string);
 StringID GetGRFStringID(uint32 grfid, uint16 stringid);
-char *GetGRFString(char *buff, uint16 stringid);
+char *GetGRFString(char *buff, uint16 stringid, const char* last);
 void CleanUpStrings(void);
 void SetCurrentGrfLangID(const char *iso_name);