diff --git a/image/iff.h b/image/iff.h
index 56d4c60e2ad..7a14c822b62 100644
--- a/image/iff.h
+++ b/image/iff.h
@@ -82,8 +82,8 @@ public:
 	virtual ~IFFDecoder();
 
 	// ImageDecoder API
-	void destroy();
-	bool loadStream(Common::SeekableReadStream &stream);
+	void destroy() override;
+	bool loadStream(Common::SeekableReadStream &stream) override;
 	const Header *getHeader() const { return &_header; }
 	const Graphics::Surface *getSurface() const override { return _surface; }
 	const Graphics::Palette &getPalette() const override { return _palette; }
diff --git a/image/pcx.h b/image/pcx.h
index 42c7e1c21cd..1e43741fcd7 100644
--- a/image/pcx.h
+++ b/image/pcx.h
@@ -54,8 +54,8 @@ public:
 	virtual ~PCXDecoder();
 
 	// ImageDecoder API
-	void destroy();
-	virtual bool loadStream(Common::SeekableReadStream &stream);
+	void destroy() override;
+	virtual bool loadStream(Common::SeekableReadStream &stream) override;
 	const Graphics::Surface *getSurface() const override { return _surface; }
 	const Graphics::Palette &getPalette() const override { return _palette; }
 
diff --git a/image/tga.h b/image/tga.h
index f99f00465d7..8f19d0f22d3 100644
--- a/image/tga.h
+++ b/image/tga.h
@@ -67,10 +67,10 @@ class TGADecoder : public ImageDecoder {
 public:
 	TGADecoder();
 	virtual ~TGADecoder();
-	virtual void destroy();
+	virtual void destroy() override;
 	const Graphics::Surface *getSurface() const override { return &_surface; }
 	const Graphics::Palette &getPalette() const override { return _colorMap; }
-	virtual bool loadStream(Common::SeekableReadStream &stream);
+	virtual bool loadStream(Common::SeekableReadStream &stream) override;
 private:
 	// Format-spec from:
 	//http://www.ludorg.net/amnesia/TGA_File_Format_Spec.html