diff --git a/clients/aurorae/src/aurorae.cpp b/clients/aurorae/src/aurorae.cpp
index 08431a3544..6d8a5c0ce2 100644
--- a/clients/aurorae/src/aurorae.cpp
+++ b/clients/aurorae/src/aurorae.cpp
@@ -103,6 +103,8 @@ bool AuroraeFactory::supports(Ability ability) const
         return true; // TODO: correct value from theme
     case AbilityClientGrouping:
         return true;
+    case AbilityUsesBlurBehind:
+        return true;
     default:
         return false;
     }
diff --git a/effects.cpp b/effects.cpp
index 14d7a6b2b8..b96a00ba99 100644
--- a/effects.cpp
+++ b/effects.cpp
@@ -266,6 +266,11 @@ bool EffectsHandlerImpl::decorationsHaveAlpha() const
     return Workspace::self()->decorationHasAlpha();
     }
 
+bool EffectsHandlerImpl::decorationSupportsBlurBehind() const
+    {
+    return Workspace::self()->decorationSupportsBlurBehind();
+    }
+
 // start another painting pass
 void EffectsHandlerImpl::startPaint()
     {
diff --git a/effects.h b/effects.h
index ab07abe9bd..796a47c319 100644
--- a/effects.h
+++ b/effects.h
@@ -146,6 +146,8 @@ class EffectsHandlerImpl : public EffectsHandler
 
         virtual bool decorationsHaveAlpha() const;
 
+        virtual bool decorationSupportsBlurBehind() const;
+
         virtual EffectFrame* effectFrame( EffectFrameStyle style, bool staticSize, const QPoint& position, Qt::Alignment alignment ) const;
 
         // internal (used by kwin core or compositing code)
diff --git a/effects/blur/blur.cpp b/effects/blur/blur.cpp
index c024632e33..7420b89787 100644
--- a/effects/blur/blur.cpp
+++ b/effects/blur/blur.cpp
@@ -167,7 +167,7 @@ QRegion BlurEffect::blurRegion(const EffectWindow *w) const
     if (value.isValid()) {
         const QRegion appRegion = qvariant_cast<QRegion>(value);
         if (!appRegion.isEmpty()) {
-            if (w->hasDecoration()) {
+            if (w->hasDecoration() && effects->decorationSupportsBlurBehind()) {
                 region = w->shape();
                 region -= w->decorationInnerRect();
                 region |= appRegion.translated(w->contentsRect().topLeft()) &
@@ -179,7 +179,7 @@ QRegion BlurEffect::blurRegion(const EffectWindow *w) const
             // for the whole window.
             region = w->shape();
         }
-    } else if (w->hasDecoration()) {
+    } else if (w->hasDecoration() && effects->decorationSupportsBlurBehind()) {
         // If the client hasn't specified a blur region, we'll only enable
         // the effect behind the decoration.
         region = w->shape();
@@ -236,7 +236,7 @@ void BlurEffect::drawWindow(EffectWindow *w, int mask, QRegion region, WindowPai
     bool scaled = !qFuzzyCompare(data.xScale, 1.0) && !qFuzzyCompare(data.yScale, 1.0);
     bool translated = data.xTranslate || data.yTranslate;
     bool transformed = scaled || translated || mask & PAINT_WINDOW_TRANSFORMED;
-    bool hasAlpha = w->hasAlpha() || (w->hasDecoration() && effects->decorationsHaveAlpha());
+    bool hasAlpha = w->hasAlpha() || (w->hasDecoration() && effects->decorationsHaveAlpha() && effects->decorationSupportsBlurBehind());
     bool valid = target->valid() && shader->isValid();
 
     QRegion shape;
diff --git a/lib/kdecoration.h b/lib/kdecoration.h
index 553ae09eec..4881beabc4 100644
--- a/lib/kdecoration.h
+++ b/lib/kdecoration.h
@@ -200,6 +200,8 @@ public:
                                         ///  @since 4.3
         AbilityExtendIntoClientArea = 3002, ///< The decoration respects transparentRect()
                                             ///  @since 4.4
+        AbilityUsesBlurBehind = 3003, ///< The decoration wants the background to be blurred, when the blur plugin is enabled.
+                                     /// @since 4.6
         // Tabbing
         AbilityClientGrouping = 4000, ///< The decoration supports tabbing
         // TODO colors for individual button types
diff --git a/lib/kwineffects.h b/lib/kwineffects.h
index 40e7922a84..ec1fb316e4 100644
--- a/lib/kwineffects.h
+++ b/lib/kwineffects.h
@@ -171,7 +171,7 @@ X-KDE-Library=kwin4_effect_cooleffect
 
 #define KWIN_EFFECT_API_MAKE_VERSION( major, minor ) (( major ) << 8 | ( minor ))
 #define KWIN_EFFECT_API_VERSION_MAJOR 0
-#define KWIN_EFFECT_API_VERSION_MINOR 156
+#define KWIN_EFFECT_API_VERSION_MINOR 157
 #define KWIN_EFFECT_API_VERSION KWIN_EFFECT_API_MAKE_VERSION( \
     KWIN_EFFECT_API_VERSION_MAJOR, KWIN_EFFECT_API_VERSION_MINOR )
 
@@ -795,6 +795,12 @@ class KWIN_EXPORT EffectsHandler
          */
         virtual bool decorationsHaveAlpha() const = 0;
 
+        /**
+         * Returns @a true if the window decorations support blurring behind the decoration, and @a false otherwise
+         * @since 4.6
+         */
+        virtual bool decorationSupportsBlurBehind() const = 0;
+
         /**
          * Checks if the driver is on given blacklist.
          * The format of the blacklist is driver identifier as key (e.g. Intel) with a list of
diff --git a/workspace.h b/workspace.h
index 8a07fe9794..12ec259200 100644
--- a/workspace.h
+++ b/workspace.h
@@ -435,6 +435,7 @@ class Workspace : public QObject, public KDecorationDefines
         bool decorationHasAlpha() const;
         bool decorationSupportsClientGrouping() const; // Returns true if the decoration supports tabs.
         bool decorationSupportsFrameOverlap() const;
+        bool decorationSupportsBlurBehind() const;
 
         // D-Bus interface
         void cascadeDesktop();
@@ -1376,6 +1377,11 @@ inline bool Workspace::decorationSupportsFrameOverlap() const
     return mgr->factory()->supports( AbilityExtendIntoClientArea );
     }
 
+inline bool Workspace::decorationSupportsBlurBehind() const
+    {
+    return mgr->factory()->supports( AbilityUsesBlurBehind );
+    }
+
 inline void Workspace::addClientGroup( ClientGroup* group )
     {
     clientGroups.append( group );