diff --git a/examples/example.manifest b/examples/example.manifest
index b2991af..54b7d3f 100644
--- a/examples/example.manifest
+++ b/examples/example.manifest
@@ -27,8 +27,8 @@
   </compatibility>
   <application xmlns="urn:schemas-microsoft-com:asm.v3">
     <windowsSettings>
-      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">True/PM</dpiAware>
-      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor</dpiAwareness>
+      <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">True/PM, True</dpiAware>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor, System</dpiAwareness>
     </windowsSettings>
   </application>
 </assembly>
diff --git a/framelesshelper.cpp b/framelesshelper.cpp
index cf4a8bb..687049c 100644
--- a/framelesshelper.cpp
+++ b/framelesshelper.cpp
@@ -70,6 +70,9 @@ bool FramelessHelper::eventFilter(QObject *object, QEvent *event)
         return false;
     }
     const auto window = qobject_cast<QWindow *>(object);
+    if (Utilities::isWindowFixedSize(window)) {
+        return false;
+    }
     const auto mouseEvent = static_cast<QMouseEvent *>(event);
 #if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
     const QPointF localPos = mouseEvent->position();
diff --git a/framelesshelper_win32.cpp b/framelesshelper_win32.cpp
index ab4448d..b47bea3 100644
--- a/framelesshelper_win32.cpp
+++ b/framelesshelper_win32.cpp
@@ -584,6 +584,10 @@ bool FramelessHelperWin::nativeEventFilter(const QByteArray &eventType, void *me
         // another branch, if you are interested in it, you can give it a
         // try.
 
+        if (Utilities::isWindowFixedSize(window)) {
+            *result = HTCLIENT;
+            return true;
+        }
         const POINT globalPos = {GET_X_LPARAM(msg->lParam), GET_Y_LPARAM(msg->lParam)};
         POINT localPos = globalPos;
         if (ScreenToClient(msg->hwnd, &localPos) == FALSE) {
diff --git a/utilities.cpp b/utilities.cpp
index 790712c..76ccace 100644
--- a/utilities.cpp
+++ b/utilities.cpp
@@ -79,4 +79,18 @@ Qt::Edges Utilities::calculateWindowEdges(const QWindow *window, const QPointF &
     return edges;
 }
 
+bool Utilities::isWindowFixedSize(const QWindow *window)
+{
+    Q_ASSERT(window);
+    if (!window) {
+        return false;
+    }
+    if (window->flags() & Qt::MSWindowsFixedSizeDialogHint) {
+        return true;
+    }
+    const QSize minSize = window->minimumSize();
+    const QSize maxSize = window->maximumSize();
+    return (!minSize.isEmpty() && !maxSize.isEmpty() && (minSize == maxSize));
+}
+
 FRAMELESSHELPER_END_NAMESPACE
diff --git a/utilities.h b/utilities.h
index 6f2400f..86d3bda 100644
--- a/utilities.h
+++ b/utilities.h
@@ -36,6 +36,7 @@ namespace Utilities
 [[nodiscard]] FRAMELESSHELPER_API Qt::Edges calculateWindowEdges(const QWindow *window, const QPointF &pos);
 FRAMELESSHELPER_API void startSystemMove(QWindow *window);
 FRAMELESSHELPER_API void startSystemResize(QWindow *window, const Qt::Edges edges);
+[[nodiscard]] FRAMELESSHELPER_API bool isWindowFixedSize(const QWindow *window);
 
 #ifdef Q_OS_WINDOWS
 [[nodiscard]] FRAMELESSHELPER_API bool isWin8OrGreater();