1 files changed, 6 insertions, 0 deletions
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index ee9bf9936c..00229a7540 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -110,6 +110,8 @@ static QByteArray debugWinExStyle(DWORD exStyle)
         rc += " WS_EX_CONTEXTHELP";
     if (exStyle & WS_EX_LAYERED)
         rc += " WS_EX_LAYERED";
+    if (exStyle & WS_EX_DLGMODALFRAME)
+        rc += " WS_EX_DLGMODALFRAME";
     return rc;
 }
 
@@ -513,6 +515,10 @@ void WindowCreationData::fromWindow(const QWindow *w, const Qt::WindowFlags flag
                 }
                 if (flags & Qt::WindowSystemMenuHint)
                     style |= WS_SYSMENU;
+                else if (dialog) {
+                    style |= WS_SYSMENU | WS_BORDER; // QTBUG-2027, dialogs without system menu.
+                    exStyle |= WS_EX_DLGMODALFRAME;
+                }
                 if (flags & Qt::WindowMinimizeButtonHint)
                     style |= WS_MINIMIZEBOX;
                 if (shouldShowMaximizeButton(w, flags))