diff --git a/dtrans/test/win32/dnd/atlwindow.cxx b/dtrans/test/win32/dnd/atlwindow.cxx
index 7aa0df7ce0ac074a4b7f78589c7ab2625a90064e..9e1e2e1fc693fa6c1f91b4ab423c132a88ba97ff 100644
--- a/dtrans/test/win32/dnd/atlwindow.cxx
+++ b/dtrans/test/win32/dnd/atlwindow.cxx
@@ -181,7 +181,7 @@ LRESULT AWindow::OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled
 
                 data.evtThreadReady= CreateEvent( NULL, FALSE, FALSE, NULL);
 
-                HANDLE hThread= CreateThread( NULL, 0, MTAFunc, &data, 0, &mtaThreadId);
+                CloseHandle(CreateThread(NULL, 0, MTAFunc, &data, 0, &mtaThreadId));
                 // We must wait until the thread copied the ThreadData structure
                 WaitForSingleObject( data.evtThreadReady, INFINITE);
                 CloseHandle( data.evtThreadReady);
diff --git a/sal/osl/w32/dllentry.cxx b/sal/osl/w32/dllentry.cxx
index 8e8c0feda62cd38625acf82fe6973dcca19804d7..e9323248e3db5ea7b0e47e641564a547f370d090 100644
--- a/sal/osl/w32/dllentry.cxx
+++ b/sal/osl/w32/dllentry.cxx
@@ -221,13 +221,17 @@ BOOL WINAPI DllMain( HINSTANCE, DWORD fdwReason, LPVOID )
                 {
                     // No error check, it works or it does not
                     // Thread should only be started for headless mode, see desktop/win32/source/officeloader.cxx
-                    CreateThread( nullptr, 0, ParentMonitorThreadProc, reinterpret_cast<LPVOID>(dwParentProcessId), 0, &dwThreadId );
+                    HANDLE hThread
+                        = CreateThread(nullptr, 0, ParentMonitorThreadProc,
+                                       reinterpret_cast<LPVOID>(dwParentProcessId), 0, &dwThreadId);
                     // Note: calling CreateThread in DllMain is discouraged
                     // but this is only done in the headless mode and in
                     // that case no other threads should be running at startup
                     // when sal3.dll is loaded; also there is no
                     // synchronization with the spawned thread, so there
                     // does not appear to be a real risk of deadlock here
+                    if (hThread)
+                        CloseHandle(hThread);
                 }
             }
 
diff --git a/sfx2/source/appl/shutdowniconw32.cxx b/sfx2/source/appl/shutdowniconw32.cxx
index 8ff9c621009d901257ef920a2415f5152b3a8cdb..47fb95c37f4a4d2fe9a401cbfdfb0c7fe58ba6e2 100644
--- a/sfx2/source/appl/shutdowniconw32.cxx
+++ b/sfx2/source/appl/shutdowniconw32.cxx
@@ -528,7 +528,7 @@ void win32_init_sys_tray()
             );
 
         DWORD   dwThreadId;
-        CreateThread( nullptr, 0, SystrayThread, nullptr, 0, &dwThreadId );
+        CloseHandle(CreateThread(nullptr, 0, SystrayThread, nullptr, 0, &dwThreadId));
     }
 }