diff --git a/kstyle/breezeshadowhelper.cpp b/kstyle/breezeshadowhelper.cpp
--- a/kstyle/breezeshadowhelper.cpp
+++ b/kstyle/breezeshadowhelper.cpp
@@ -293,7 +293,7 @@
             .expandedTo(BoxShadowRenderer::calculateMinimumBoxSize(params.shadow2.radius));
 
         #if QT_VERSION >= 0x050300
-        const qreal dpr = qApp->devicePixelRatio();
+        const qreal dpr = Helper::isWayland() ? 1.0 : qApp->devicePixelRatio();
         #else
         const qreal dpr = 1.0;
         #endif
@@ -616,15 +616,17 @@
             }
         }
 
+        if (!Helper::isWayland()) {
 #if BREEZE_USE_KDE4
-        const qreal dpr = _helper.devicePixelRatio(_shadowTiles.pixmap(0));
-        margins.setLeft(margins.left() * dpr);
-        margins.setTop(margins.top() * dpr);
-        margins.setRight(margins.right() * dpr);
-        margins.setBottom(margins.bottom() * dpr);
+            const qreal dpr = _helper.devicePixelRatio(_shadowTiles.pixmap(0));
+            margins.setLeft(margins.left() * dpr);
+            margins.setTop(margins.top() * dpr);
+            margins.setRight(margins.right() * dpr);
+            margins.setBottom(margins.bottom() * dpr);
 #else
-        margins *= _helper.devicePixelRatio(_shadowTiles.pixmap(0));
+            margins *= _helper.devicePixelRatio(_shadowTiles.pixmap(0));
 #endif
+        }
 
         return margins;
     }