diff --git a/Windows/CaptureDevice.h b/Windows/CaptureDevice.h
index 64ef4926a6..d457702afe 100644
--- a/Windows/CaptureDevice.h
+++ b/Windows/CaptureDevice.h
@@ -113,7 +113,7 @@ template <class T> void SafeRelease(T **ppT) {
 
 class WindowsCaptureDevice;
 
-class ReaderCallback : public IMFSourceReaderCallback {
+class ReaderCallback final : public IMFSourceReaderCallback {
 public:
 	ReaderCallback(WindowsCaptureDevice *device);
 	~ReaderCallback();
diff --git a/Windows/W32Util/PropertySheet.h b/Windows/W32Util/PropertySheet.h
index 53ea0c5b8b..29e7814e8c 100644
--- a/Windows/W32Util/PropertySheet.h
+++ b/Windows/W32Util/PropertySheet.h
@@ -57,9 +57,8 @@ namespace W32Util
 		LPCTSTR header;
 		HFONT hTitleFont;
 		HICON icon;
-		struct Page 
-		{
-			Page(Tab *_tab, LPCTSTR _resource, LPCTSTR _title, LPCTSTR _subtitle = 0)
+		struct Page final {
+			Page(Tab *_tab, LPCTSTR _resource, LPCTSTR _title, LPCTSTR _subtitle = nullptr)
 				: tab(_tab), resource(_resource), title(_title), hdrSubTitle(_subtitle) {}
 			Tab *tab;
 			LPCTSTR resource;
@@ -78,7 +77,4 @@ namespace W32Util
 		HFONT GetTitleFont() {return hTitleFont;}
 		static int CALLBACK Callback(HWND hwndDlg, UINT uMsg, LPARAM lParam);
 	};
-
-
-
-}
\ No newline at end of file
+}
diff --git a/Windows/WASAPIStream.cpp b/Windows/WASAPIStream.cpp
index 2bf597761d..347f5e0560 100644
--- a/Windows/WASAPIStream.cpp
+++ b/Windows/WASAPIStream.cpp
@@ -31,7 +31,7 @@ const IID IID_IAudioRenderClient = __uuidof(IAudioRenderClient);
               if ((punk) != NULL)  \
                 { (punk)->Release(); (punk) = NULL; }
 
-class CMMNotificationClient : public IMMNotificationClient {
+class CMMNotificationClient final : public IMMNotificationClient {
 public:
 	CMMNotificationClient() {
 	}