diff --git a/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.cpp b/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.cpp
index 2047050de3..f3294c0a92 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.cpp
+++ b/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.cpp
@@ -30,6 +30,15 @@ None::None(ExtensionReg& reg) : Attachment("None", reg)
   m_id = nothing_id;
 }
 
+void Attachment::GetState(u8* const data)
+{
+}
+
+bool Attachment::IsButtonPressed() const
+{
+  return false;
+}
+
 std::string Attachment::GetName() const
 {
   return m_name;
@@ -42,7 +51,7 @@ void Attachment::Reset()
   std::copy(m_id.cbegin(), m_id.cend(), m_reg.constant_id);
   std::copy(m_calibration.cbegin(), m_calibration.cend(), m_reg.calibration);
 }
-}
+}  // namespace WiimoteEmu
 
 void ControllerEmu::Extension::GetState(u8* const data)
 {
diff --git a/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.h b/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.h
index 385c79efe0..f1cffa44c3 100644
--- a/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.h
+++ b/Source/Core/Core/HW/WiimoteEmu/Attachment/Attachment.h
@@ -18,8 +18,9 @@ class Attachment : public ControllerEmu
 public:
   Attachment(const char* const name, ExtensionReg& reg);
 
-  virtual void GetState(u8* const data) {}
-  virtual bool IsButtonPressed() const { return false; }
+  virtual void GetState(u8* const data);
+  virtual bool IsButtonPressed() const;
+
   void Reset();
   std::string GetName() const override;
 
@@ -40,4 +41,4 @@ class None : public Attachment
 public:
   None(ExtensionReg& reg);
 };
-}
+}  // namespace WiimoteEmu