diff --git a/effects/diminactive/diminactive.h b/effects/diminactive/diminactive.h
--- a/effects/diminactive/diminactive.h
+++ b/effects/diminactive/diminactive.h
@@ -37,6 +37,7 @@
     Q_PROPERTY(bool dimDesktop READ dimDesktop)
     Q_PROPERTY(bool dimKeepAbove READ dimKeepAbove)
     Q_PROPERTY(bool dimByGroup READ dimByGroup)
+    Q_PROPERTY(bool dimFullScreen READ dimFullScreen)
 
 public:
     DimInactiveEffect();
@@ -56,6 +57,7 @@
     bool dimDesktop() const;
     bool dimKeepAbove() const;
     bool dimByGroup() const;
+    bool dimFullScreen() const;
 
 private Q_SLOTS:
     void windowActivated(EffectWindow *w);
@@ -78,6 +80,7 @@
     bool m_dimDesktop;
     bool m_dimKeepAbove;
     bool m_dimByGroup;
+    bool m_dimFullScreen;
 
     EffectWindow *m_activeWindow;
     const EffectWindowGroup *m_activeWindowGroup;
@@ -125,6 +128,11 @@
     return m_dimByGroup;
 }
 
+inline bool DimInactiveEffect::dimFullScreen() const
+{
+    return m_dimFullScreen;
+}
+
 } // namespace KWin
 
 #endif
diff --git a/effects/diminactive/diminactive.cpp b/effects/diminactive/diminactive.cpp
--- a/effects/diminactive/diminactive.cpp
+++ b/effects/diminactive/diminactive.cpp
@@ -75,6 +75,7 @@
     m_dimDesktop = DimInactiveConfig::dimDesktop();
     m_dimKeepAbove = DimInactiveConfig::dimKeepAbove();
     m_dimByGroup = DimInactiveConfig::dimByGroup();
+    m_dimFullScreen = DimInactiveConfig::dimFullScreen();
 
     // Need to reset m_activeWindow becase canDimWindow returns false
     // if m_activeWindow is equal to effects->activeWindow().
@@ -197,6 +198,10 @@
         return false;
     }
 
+    if (w->isFullScreen() && !m_dimFullScreen) {
+        return false;
+    }
+
     if (!w->isManaged()) {
         return false;
     }
diff --git a/effects/diminactive/diminactive.kcfg b/effects/diminactive/diminactive.kcfg
--- a/effects/diminactive/diminactive.kcfg
+++ b/effects/diminactive/diminactive.kcfg
@@ -20,5 +20,8 @@
         <entry name="DimByGroup" type="Bool">
             <default>true</default>
         </entry>
+        <entry name="DimFullScreen" type="Bool">
+            <default>true</default>
+        </entry>
     </group>
 </kcfg>
diff --git a/effects/diminactive/diminactive_config.ui b/effects/diminactive/diminactive_config.ui
--- a/effects/diminactive/diminactive_config.ui
+++ b/effects/diminactive/diminactive_config.ui
@@ -69,6 +69,13 @@
      </property>
     </widget>
    </item>
+   <item row="5" column="1">
+    <widget class="QCheckBox" name="kcfg_DimFullScreen">
+     <property name="text">
+      <string>Fullscreen windows</string>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>