diff --git a/src/renderers/BMPRenderer.hpp b/src/renderers/BMPRenderer.hpp
index ecf3348..0448068 100644
--- a/src/renderers/BMPRenderer.hpp
+++ b/src/renderers/BMPRenderer.hpp
@@ -6,7 +6,7 @@
 
 namespace massivedynamic {
 
-class BMPRenderer : public PixelRenderer {
+class BMPRenderer final : public PixelRenderer {
 	public:
 		BMPRenderer(const std::vector<bool>& pixels, size_t sourceSize, size_t targetSize) : PixelRenderer(pixels, sourceSize, targetSize) {}
 
diff --git a/src/renderers/JPGRenderer.hpp b/src/renderers/JPGRenderer.hpp
index abfc8f4..1d2a63d 100644
--- a/src/renderers/JPGRenderer.hpp
+++ b/src/renderers/JPGRenderer.hpp
@@ -6,7 +6,7 @@
 
 namespace massivedynamic {
 
-class JPGRenderer : public PixelRenderer {
+class JPGRenderer final: public PixelRenderer {
 	public:
 		JPGRenderer(const std::vector<bool>& pixels, size_t sourceSize, size_t targetSize) : PixelRenderer(pixels, sourceSize, targetSize) {}
 
diff --git a/src/renderers/PNGRenderer.hpp b/src/renderers/PNGRenderer.hpp
index a0de5d7..25c2875 100644
--- a/src/renderers/PNGRenderer.hpp
+++ b/src/renderers/PNGRenderer.hpp
@@ -6,7 +6,7 @@
 
 namespace massivedynamic {
 
-class PNGRenderer : public PixelRenderer {
+class PNGRenderer final: public PixelRenderer {
 	public:
 		PNGRenderer(const std::vector<bool>& pixels, size_t sourceSize, size_t targetSize) : PixelRenderer(pixels, sourceSize, targetSize) {}