diff --git a/winnativeeventfilter.cpp b/winnativeeventfilter.cpp
index d60baf2..3a16cd6 100644
--- a/winnativeeventfilter.cpp
+++ b/winnativeeventfilter.cpp
@@ -471,7 +471,7 @@ bool WinNativeEventFilter::nativeEventFilter(const QByteArray &eventType,
             // We don't need this correction when we're fullscreen. We will have
             // the WS_POPUP size, so we don't have to worry about borders, and
             // the default frame will be fine.
-            if (IsMaximized(_hWnd) || !IsFullScreened(_hWnd)) {
+            if (IsMaximized(_hWnd) && !IsFullScreened(_hWnd)) {
                 // Windows automatically adds a standard width border to all
                 // sides when a window is maximized.
                 int frameThickness_x =