diff --git a/src/toolbar_gui.cpp b/src/toolbar_gui.cpp
--- a/src/toolbar_gui.cpp
+++ b/src/toolbar_gui.cpp
@@ -104,7 +104,7 @@ public:
 		return DropDownListStringItem::Width() + this->checkmark_width;
 	}
 
-	void Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
+	void Draw(int left, int right, int top, int bottom, bool sel, Colours bg_colour) const
 	{
 		bool rtl = _current_text_dir == TD_RTL;
 		if (this->checked) {
@@ -149,7 +149,7 @@ public:
 		return max(max(this->icon_size.height, this->lock_size.height) + 2U, (uint)FONT_HEIGHT_NORMAL);
 	}
 
-	void Draw(int left, int right, int top, int bottom, bool sel, int bg_colour) const
+	void Draw(int left, int right, int top, int bottom, bool sel, Colours bg_colour) const
 	{
 		CompanyID company = (CompanyID)this->result;
 		bool rtl = _current_text_dir == TD_RTL;