diff --git a/lib/kdecoration.h b/lib/kdecoration.h
index b4d5209093..5455a4b495 100644
--- a/lib/kdecoration.h
+++ b/lib/kdecoration.h
@@ -175,7 +175,8 @@ class KDecorationProvides
     : public KDecorationDefines
     {
     public:
-        virtual bool provides( Requirement req ) = 0;
+        virtual  ~KDecorationProvides(){};
+		virtual bool provides( Requirement req ) = 0;
     };
 
 /**
diff --git a/lib/kdecoration_p.h b/lib/kdecoration_p.h
index 433d08375a..50383d8cb7 100644
--- a/lib/kdecoration_p.h
+++ b/lib/kdecoration_p.h
@@ -60,6 +60,7 @@ class KWIN_EXPORT KDecorationOptionsPrivate : public KDecorationDefines
 class KDecorationBridge : public KDecorationDefines
     {
     public:
+	virtual ~KDecorationBridge(){};
 	virtual bool isActive() const = 0;
 	virtual bool isCloseable() const = 0;
 	virtual bool isMaximizable() const = 0;