2 files changed, 6 insertions, 0 deletions
diff --git a/cryptlib.h b/cryptlib.h
index 7b104d6..993936e 100644
--- a/cryptlib.h
+++ b/cryptlib.h
@@ -353,6 +353,8 @@ public:
 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE SimpleKeyingInterface
 {
 public:
+	virtual ~SimpleKeyingInterface() {}
+
 	//! returns smallest valid key length in bytes */
 	virtual size_t MinKeyLength() const =0;
 	//! returns largest valid key length in bytes */
@@ -678,6 +680,8 @@ class CallStack;
 class CRYPTOPP_NO_VTABLE Waitable
 {
 public:
+	virtual ~Waitable() {}
+
 	//! maximum number of wait objects that this object can return
 	virtual unsigned int GetMaxWaitObjectCount() const =0;
 	//! put wait objects into container
diff --git a/strciphr.h b/strciphr.h
index e3216a8..6a5cc97 100644
--- a/strciphr.h
+++ b/strciphr.h
@@ -64,6 +64,7 @@ enum KeystreamOperation {
 
 struct CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AdditiveCipherAbstractPolicy
 {
+	virtual ~AdditiveCipherAbstractPolicy() {}
 	virtual unsigned int GetAlignment() const {return 1;}
 	virtual unsigned int GetBytesPerIteration() const =0;
 	virtual unsigned int GetOptimalBlockSize() const {return GetBytesPerIteration();}
@@ -160,6 +161,7 @@ protected:
 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CFB_CipherAbstractPolicy
 {
 public:
+	virtual ~CFB_CipherAbstractPolicy() {}
 	virtual unsigned int GetAlignment() const =0;
 	virtual unsigned int GetBytesPerIteration() const =0;
 	virtual byte * GetRegisterBegin() =0;