diff --git a/plugins/platforms/drm/drm_output.cpp b/plugins/platforms/drm/drm_output.cpp
--- a/plugins/platforms/drm/drm_output.cpp
+++ b/plugins/platforms/drm/drm_output.cpp
@@ -712,6 +712,8 @@
     if (m_changeset->scaleChanged()) {
         qCDebug(KWIN_DRM) << "Setting scale:" << m_changeset->scale();
         setScale(m_changeset->scale());
+        m_waylandOutput->setScale(m_changeset->scale());
+        m_waylandOutputDevice->setScale(m_changeset->scale());
     }
     return true;
 }