1 files changed, 1 insertions, 1 deletions
diff --git a/gui.h b/gui.h
index 823111c8d..4867cacf8 100644
--- a/gui.h
+++ b/gui.h
@@ -35,7 +35,7 @@ void ShowMessageOptions(void);
 void ShowMessageHistory(void);
 
 /* traintoolb_gui.c */
-void ShowBuildRailToolbar(int index, int button);
+void ShowBuildRailToolbar(RailType railtype, int button);
 void PlaceProc_BuyLand(TileIndex tile);
 
 /* train_gui.c */