diff --git a/src/apu.h b/src/apu.h
index 72395f0..aba98d2 100644
--- a/src/apu.h
+++ b/src/apu.h
@@ -7,7 +7,9 @@
 
 #pragma once
 
-class APU {
+#include "processingunit.h"
+
+class APU : public ProcessingUnit {
 public:
 	APU();
 	virtual ~APU();
diff --git a/src/cpu.h b/src/cpu.h
index cea7572..1f94e0c 100644
--- a/src/cpu.h
+++ b/src/cpu.h
@@ -7,7 +7,9 @@
 
 #pragma once
 
-class CPU {
+#include "processingunit.h"
+
+class CPU final : public ProcessingUnit {
 public:
 	CPU();
 	virtual ~CPU();
diff --git a/src/ppu.h b/src/ppu.h
index 6b5adfe..9d7a0d2 100644
--- a/src/ppu.h
+++ b/src/ppu.h
@@ -7,7 +7,9 @@
 
 #pragma once
 
-class PPU {
+#include "processingunit.h"
+
+class PPU final : public ProcessingUnit {
 public:
 	PPU();
 	virtual ~PPU();
diff --git a/src/processingunit.cpp b/src/processingunit.cpp
new file mode 100644
index 0000000..851c7b8
--- /dev/null
+++ b/src/processingunit.cpp
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ * Copyright (C) 2022 Th3FrankXD
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "processingunit.h"
+
+ProcessingUnit::ProcessingUnit()
+{
+}
+
+ProcessingUnit::~ProcessingUnit()
+{
+}
diff --git a/src/processingunit.h b/src/processingunit.h
new file mode 100644
index 0000000..d43d5dd
--- /dev/null
+++ b/src/processingunit.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ * Copyright (C) 2022 Th3FrankXD
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+class ProcessingUnit {
+public:
+	ProcessingUnit();
+	virtual ~ProcessingUnit();
+};