diff --git a/src/gui/kernel/qscreen.cpp b/src/gui/kernel/qscreen.cpp
index 1e5db5c4d3..601d2f1718 100644
--- a/src/gui/kernel/qscreen.cpp
+++ b/src/gui/kernel/qscreen.cpp
@@ -89,6 +89,11 @@ void QScreenPrivate::setPlatformScreen(QPlatformScreen *screen)
     updatePrimaryOrientation(); // derived from the geometry
 }
 
+void QScreenPrivate::updateHighDpi()
+{
+    geometry = platformScreen->deviceIndependentGeometry();
+    availableGeometry = QHighDpi::fromNative(platformScreen->availableGeometry(), QHighDpiScaling::factor(platformScreen), geometry.topLeft());
+}
 
 /*!
     Destroys the screen.
diff --git a/src/gui/kernel/qscreen_p.h b/src/gui/kernel/qscreen_p.h
index 1ba0c7c442..67b42bda6f 100644
--- a/src/gui/kernel/qscreen_p.h
+++ b/src/gui/kernel/qscreen_p.h
@@ -29,11 +29,7 @@ class QScreenPrivate : public QObjectPrivate
     Q_DECLARE_PUBLIC(QScreen)
 public:
     void setPlatformScreen(QPlatformScreen *screen);
-    void updateHighDpi()
-    {
-        geometry = platformScreen->deviceIndependentGeometry();
-        availableGeometry = QHighDpi::fromNative(platformScreen->availableGeometry(), QHighDpiScaling::factor(platformScreen), geometry.topLeft());
-    }
+    void updateHighDpi();
 
     void updatePrimaryOrientation();
     void updateGeometriesWithSignals();