diff --git a/kcm/src/widget.cpp b/kcm/src/widget.cpp
--- a/kcm/src/widget.cpp
+++ b/kcm/src/widget.cpp
@@ -465,15 +465,22 @@
             qWarning() << "Failed to obtain root item";
             continue;
         }
-        QSize realSize;
+
+        QSize realSize, scaledSize;
         if (output->isHorizontal()) {
             realSize = mode->size();
         } else {
             realSize = QSize(mode->size().height(), mode->size().width());
         }
+        if (config->supportedFeatures() & KScreen::Config::Feature::PerOutputScaling) {
+            scaledSize = realSize / output->scale();
+        } else {
+            scaledSize = realSize / devicePixelRatioF();
+        }
+
         rootObj->setProperty("outputName", Utils::outputName(output));
         rootObj->setProperty("modeName", Utils::sizeToString(realSize));
-        view->setProperty("screenSize", QRect(output->pos(), realSize));
+        view->setProperty("screenSize", QRect(output->pos(), scaledSize));
         mOutputIdentifiers << view;
     }