diff --git a/src/Operation.h b/src/Operation.h
index 9fca2498c4..11c37d38f3 100644
--- a/src/Operation.h
+++ b/src/Operation.h
@@ -12,6 +12,8 @@ public:
 	virtual bool work(Interpreter* interpreter)=0;
 
 	virtual int getFee();
+
+	virtual ~Operation() { ; }
 };
 
 // this is just an Int in the code
diff --git a/src/ScriptData.h b/src/ScriptData.h
index af9ce45c0e..66fe2ed3e4 100644
--- a/src/ScriptData.h
+++ b/src/ScriptData.h
@@ -9,6 +9,8 @@ class Data
 public:
 	typedef boost::shared_ptr<Data> pointer;
 
+	virtual ~Data(){ ; }
+
 	virtual bool isInt32(){ return(false); }
 	virtual bool isFloat(){ return(false); }
 	virtual bool isUint160(){ return(false); }
diff --git a/src/TransactionMeta.h b/src/TransactionMeta.h
index 729a724808..b62f9f3617 100644
--- a/src/TransactionMeta.h
+++ b/src/TransactionMeta.h
@@ -46,6 +46,7 @@ protected:
 
 public:
 	TransactionMetaNodeEntry(int type) : mType(type) { ; }
+	virtual ~TransactionMetaNodeEntry() { ; }
 
 	int getType() const { return mType; }
 	virtual Json::Value getJson(int) const = 0;