diff --git a/src/ScreenWindow.h b/src/ScreenWindow.h
index 7433e3634..11d599b25 100644
--- a/src/ScreenWindow.h
+++ b/src/ScreenWindow.h
@@ -63,7 +63,7 @@ public:
      * to notify the window when the associated screen has changed and synchronize selection updates
      * between all views on a session.
      */
-    ScreenWindow(Screen* screen, QObject* parent = 0);
+    explicit ScreenWindow(Screen* screen, QObject* parent = 0);
     virtual ~ScreenWindow();
 
     /** Sets the screen which this window looks onto */