1 files changed, 1 insertions, 0 deletions
diff --git a/gui.h b/gui.h
index 960b2741a..8b37b64a9 100644
--- a/gui.h
+++ b/gui.h
@@ -17,6 +17,7 @@ void ShowGameOptions(void);
 void ShowGameDifficulty(void);
 void ShowPatchesSelection(void);
 void ShowNewgrf(void);
+void DrawArrowButtons(int x, int y, int ctab, byte state, bool enabled);
 
 /* graph_gui.c */
 void ShowOperatingProfitGraph(void);