1 files changed, 1 insertions, 1 deletions
diff --git a/src/gui.h b/src/gui.h
index d7e35f41e..8c3876b52 100644
--- a/src/gui.h
+++ b/src/gui.h
@@ -23,7 +23,7 @@ void InitializeGUI();
 void ShowGameOptions();
 void ShowGameDifficulty();
 void ShowPatchesSelection();
-void DrawArrowButtons(int x, int y, int ctab, byte state, bool clickable_left, bool clickable_right);
+void DrawArrowButtons(int x, int y, Colours button_colour, byte state, bool clickable_left, bool clickable_right);
 
 /* graph_gui.cpp */
 void ShowOperatingProfitGraph();