diff --git a/src/declarativeimports/core/iconitem.cpp b/src/declarativeimports/core/iconitem.cpp
--- a/src/declarativeimports/core/iconitem.cpp
+++ b/src/declarativeimports/core/iconitem.cpp
@@ -598,7 +598,7 @@
         }
     } else if (!m_icon.isNull()) {
         KIconLoader::global()->setCustomPalette(Plasma::Theme().palette());
-        result = m_icon.pixmap(QSize(size, size) * (window() ? window()->devicePixelRatio() : qApp->devicePixelRatio()));
+        result = m_icon.pixmap(window(), QSize(size, size));
         KIconLoader::global()->resetPalette();
     } else if (!m_imageIcon.isNull()) {
         result = QPixmap::fromImage(m_imageIcon);
diff --git a/src/declarativeimports/core/windowthumbnail.cpp b/src/declarativeimports/core/windowthumbnail.cpp
--- a/src/declarativeimports/core/windowthumbnail.cpp
+++ b/src/declarativeimports/core/windowthumbnail.cpp
@@ -381,7 +381,7 @@
         // fallback to plasma icon
         icon = QIcon::fromTheme(QStringLiteral("plasma"));
     }
-    QImage image = icon.pixmap(boundingRect().size().toSize()).toImage();
+    QImage image = icon.pixmap(window(), boundingRect().size().toSize()).toImage();
     textureNode->reset(window()->createTextureFromImage(image, QQuickWindow::TextureCanUseAtlas));
 }