diff --git a/src/company_gui.cpp b/src/company_gui.cpp
index de5498102d..3862cd9da3 100644
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -524,17 +524,17 @@ public:
 		return this->result >= COLOUR_END ? STR_COLOUR_DEFAULT : _colour_dropdown[this->result];
 	}
 
-	uint Height(uint width) const
+	uint Height(uint width) const override
 	{
 		return max(FONT_HEIGHT_NORMAL, ScaleGUITrad(12) + 2);
 	}
 
-	bool Selectable() const
+	bool Selectable() const override
 	{
 		return true;
 	}
 
-	void Draw(int left, int right, int top, int bottom, bool sel, Colours bg_colour) const
+	void Draw(int left, int right, int top, int bottom, bool sel, Colours bg_colour) const override
 	{
 		bool rtl = _current_text_dir == TD_RTL;
 		int height = bottom - top;
diff --git a/src/toolbar_gui.cpp b/src/toolbar_gui.cpp
index c3bf5953d7..c3555f107a 100644
--- a/src/toolbar_gui.cpp
+++ b/src/toolbar_gui.cpp
@@ -127,12 +127,12 @@ public:
 		this->lock_size = GetSpriteSize(SPR_LOCK);
 	}
 
-	bool Selectable() const
+	bool Selectable() const override
 	{
 		return true;
 	}
 
-	uint Width() const
+	uint Width() const override
 	{
 		CompanyID company = (CompanyID)this->result;
 		SetDParam(0, company);
@@ -140,12 +140,12 @@ public:
 		return GetStringBoundingBox(STR_COMPANY_NAME_COMPANY_NUM).width + this->icon_size.width + this->lock_size.width + 6;
 	}
 
-	uint Height(uint width) const
+	uint Height(uint width) const override
 	{
 		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, Colours bg_colour) const
+	void Draw(int left, int right, int top, int bottom, bool sel, Colours bg_colour) const override
 	{
 		CompanyID company = (CompanyID)this->result;
 		bool rtl = _current_text_dir == TD_RTL;
diff --git a/src/widgets/dropdown_type.h b/src/widgets/dropdown_type.h
index 8300dd26d7..56510b0abe 100644
--- a/src/widgets/dropdown_type.h
+++ b/src/widgets/dropdown_type.h
@@ -44,9 +44,9 @@ public:
 
 	DropDownListStringItem(StringID string, int result, bool masked) : DropDownListItem(result, masked), string(string) {}
 
-	virtual bool Selectable() const { return true; }
-	virtual uint Width() const;
-	virtual void Draw(int left, int right, int top, int bottom, bool sel, Colours bg_colour) const;
+	bool Selectable() const override { return true; }
+	uint Width() const override;
+	void Draw(int left, int right, int top, int bottom, bool sel, Colours bg_colour) const override;
 	virtual StringID String() const { return this->string; }
 
 	static int CDECL NatSortFunc(const DropDownListItem * const *first, const DropDownListItem * const *second);
@@ -61,8 +61,8 @@ public:
 
 	DropDownListParamStringItem(StringID string, int result, bool masked) : DropDownListStringItem(string, result, masked) {}
 
-	virtual StringID String() const;
-	virtual void SetParam(uint index, uint64 value) { decode_params[index] = value; }
+	StringID String() const override;
+	void SetParam(uint index, uint64 value) { decode_params[index] = value; }
 };
 
 /**
@@ -74,7 +74,7 @@ public:
 
 	DropDownListCharStringItem(const char *raw_string, int result, bool masked) : DropDownListStringItem(STR_JUST_RAW_STRING, result, masked), raw_string(raw_string) {}
 
-	virtual StringID String() const;
+	StringID String() const override;
 };
 
 /**