diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 3cf9481..63c8e96 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -1839,8 +1839,19 @@ void QWindowsWindow::requestActivateWindow()
     // 'Active' state handling is based in focus since it needs to work for
     // child windows as well.
     if (m_data.hwnd) {
+        BOOL attached = FALSE;
+
+        HWND foregroundWindow = GetForegroundWindow();
+        DWORD foregroundThread = foregroundWindow ? GetWindowThreadProcessId(foregroundWindow, NULL) : 0;
+        DWORD currentThread = GetCurrentThreadId();
+        if(foregroundThread && foregroundThread != currentThread)
+            attached = AttachThreadInput( foregroundThread, currentThread, TRUE);
+
         SetForegroundWindow(m_data.hwnd);
         SetFocus(m_data.hwnd);
+
+        if(attached)
+            AttachThreadInput( foregroundThread, currentThread, FALSE);
     }
 }