diff --git a/src/plugins/platforms/qnx/qqnxwindow.cpp b/src/plugins/platforms/qnx/qqnxwindow.cpp
index e872e372bfa..e14f18b2c5d 100644
--- a/src/plugins/platforms/qnx/qqnxwindow.cpp
+++ b/src/plugins/platforms/qnx/qqnxwindow.cpp
@@ -647,6 +647,12 @@ void QQnxWindow::setWindowState(Qt::WindowState state)
         applyWindowState();
 }
 
+void QQnxWindow::propagateSizeHints()
+{
+    // nothing to do; silence base class warning
+    qWindowDebug() << Q_FUNC_INFO << ": ignored";
+}
+
 void QQnxWindow::gainedFocus()
 {
     qWindowDebug() << Q_FUNC_INFO << "window =" << window();
diff --git a/src/plugins/platforms/qnx/qqnxwindow.h b/src/plugins/platforms/qnx/qqnxwindow.h
index 63d5dc09796..e30a469be70 100644
--- a/src/plugins/platforms/qnx/qqnxwindow.h
+++ b/src/plugins/platforms/qnx/qqnxwindow.h
@@ -103,6 +103,8 @@ public:
     void requestActivateWindow();
     void setWindowState(Qt::WindowState state);
 
+    void propagateSizeHints();
+
     void gainedFocus();
 
     QQnxScreen *screen() const { return m_screen; }