diff --git a/kstyle/breezeblurhelper.cpp b/kstyle/breezeblurhelper.cpp
index 90005065..7c30b475 100644
--- a/kstyle/breezeblurhelper.cpp
+++ b/kstyle/breezeblurhelper.cpp
@@ -1,111 +1,171 @@
 //////////////////////////////////////////////////////////////////////////////
 // breezeblurhelper.cpp
 // handle regions passed to kwin for blurring
 // -------------------
 //
 // Copyright (C) 2018 Alex Nemeth <alex.nemeth329@gmail.com>
 //
 // Largely rewritten from Oxygen widget style
 // Copyright (C) 2007 Thomas Luebking <thomas.luebking@web.de>
 // Copyright (c) 2010 Hugo Pereira Da Costa <hugo.pereira@free.fr>
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to
 // deal in the Software without restriction, including without limitation the
 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 // sell copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
 // The above copyright notice and this permission notice shall be included in
 // all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 // IN THE SOFTWARE.
 //////////////////////////////////////////////////////////////////////////////
 
 #include "breezeblurhelper.h"
 #include "breezestyleconfigdata.h"
 
 #include <KWindowEffects>
 
+#include <QApplication>
 #include <QEvent>
 #include <QVector>
 
+namespace
+{
+
+QRegion roundedRegion(const QRect &rect, int radius)
+{
+    QRegion region(rect, QRegion::Rectangle);
+
+    // Round top-left corner.
+    const QRegion topLeftCorner(rect.x(), rect.y(), radius, radius, QRegion::Rectangle);
+    const QRegion topLeftRounded(rect.x(), rect.y(), 2 * radius, 2 * radius, QRegion::Ellipse);
+    const QRegion topLeftEar = topLeftCorner - topLeftRounded;
+    region -= topLeftEar;
+
+    // Round top-right corner.
+    const QRegion topRightCorner(
+        rect.x() + rect.width() - radius, rect.y(),
+        radius, radius, QRegion::Rectangle);
+    const QRegion topRightRounded(
+        rect.x() + rect.width() - 2 * radius, rect.y(),
+        2 * radius, 2 * radius, QRegion::Ellipse);
+    const QRegion topRightEar = topRightCorner - topRightRounded;
+    region -= topRightEar;
+
+    // Round bottom-right corner.
+    const QRegion bottomRightCorner(
+        rect.x() + rect.width() - radius, rect.y() + rect.height() - radius,
+        radius, radius, QRegion::Rectangle);
+    const QRegion bottomRightRounded(
+        rect.x() + rect.width() - 2 * radius, rect.y() + rect.height() - 2 * radius,
+        2 * radius, 2 * radius, QRegion::Ellipse);
+    const QRegion bottomRightEar = bottomRightCorner - bottomRightRounded;
+    region -= bottomRightEar;
+
+    // Round bottom-left corner.
+    const QRegion bottomLeftCorner(
+        rect.x(), rect.y() + rect.height() - radius,
+        radius, radius, QRegion::Rectangle);
+    const QRegion bottomLeftRounded(
+        rect.x(), rect.y() + rect.height() - 2 * radius,
+        2 * radius, 2 * radius, QRegion::Ellipse);
+    const QRegion bottomLeftEar = bottomLeftCorner - bottomLeftRounded;
+    region -= bottomLeftEar;
+
+    return region;
+}
+
+}
+
 namespace Breeze
 {
     //___________________________________________________________
     BlurHelper::BlurHelper(QObject* parent):
         QObject(parent)
     {
     }
 
     //___________________________________________________________
     void BlurHelper::registerWidget(QWidget* widget)
     {
         // install event filter
         addEventFilter(widget);
 
         // schedule shadow area repaint
         update(widget);
     }
 
     //___________________________________________________________
     void BlurHelper::unregisterWidget(QWidget* widget)
     {
         // remove event filter
         widget->removeEventFilter(this);
     }
 
     //___________________________________________________________
     bool BlurHelper::eventFilter(QObject* object, QEvent* event)
     {
         switch (event->type()) {
             case QEvent::Hide:
             case QEvent::Show:
             case QEvent::Resize:
             {
                 // cast to widget and check
                 QWidget* widget(qobject_cast<QWidget*>(object));
 
                 if (!widget)
                     break;
 
                 update(widget);
                 break;
             }
 
             default: break;
         }
 
         // never eat events
         return false;
     }
 
     //___________________________________________________________
     void BlurHelper::update(QWidget* widget) const
     {
         #if BREEZE_HAVE_X11
         /*
         directly from bespin code. Supposibly prevent playing with some 'pseudo-widgets'
         that have winId matching some other -random- window
         */
         if (!(widget->testAttribute(Qt::WA_WState_Created) || widget->internalWinId()))
             return;
 
-        KWindowEffects::enableBlurBehind(widget->winId(), true);
+        #if QT_VERSION >= 0x050300
+        const qreal dpr = qApp->devicePixelRatio();
+        #else
+        const qreal dpr = 1.0;
+        #endif
+
+        const QRect rect = widget->rect();
+        const QRect scaledRect = QRect(rect.topLeft() * dpr, rect.size() * dpr);
+        const int scaledRadius = qRound(Metrics::Frame_FrameRadius * dpr);
+
+        const QRegion blurRegion = roundedRegion(scaledRect, scaledRadius);
+        KWindowEffects::enableBlurBehind(widget->winId(), true, blurRegion);
 
         // force update
         if (widget->isVisible()) {
             widget->update();
         }
 
         #else
         Q_UNUSED( widget )
         #endif
     }
 }