diff --git a/Source/Core/Core/HW/GCKeyboardEmu.h b/Source/Core/Core/HW/GCKeyboardEmu.h
index 6f48b465e3..d1729e6a9b 100644
--- a/Source/Core/Core/HW/GCKeyboardEmu.h
+++ b/Source/Core/Core/HW/GCKeyboardEmu.h
@@ -25,7 +25,7 @@ enum class KeyboardGroup
 class GCKeyboard : public ControllerEmu
 {
 public:
-  GCKeyboard(const unsigned int index);
+  explicit GCKeyboard(unsigned int index);
   KeyboardStatus GetInput() const;
   std::string GetName() const override;
   ControlGroup* GetGroup(KeyboardGroup group);