diff --git a/eccrypto.h b/eccrypto.h
index 92612967..be742668 100644
--- a/eccrypto.h
+++ b/eccrypto.h
@@ -213,6 +213,7 @@ template <class EC>
 class DL_Algorithm_ECDSA : public DL_Algorithm_GDSA<typename EC::Point>
 {
 public:
+	virtual ~DL_Algorithm_ECDSA() { }
 	static const char * CRYPTOPP_API StaticAlgorithmName() {return "ECDSA";}
 };
 
@@ -221,6 +222,7 @@ template <class EC>
 class DL_Algorithm_ECNR : public DL_Algorithm_NR<typename EC::Point>
 {
 public:
+	virtual ~DL_Algorithm_ECNR() { }
 	static const char * CRYPTOPP_API StaticAlgorithmName() {return "ECNR";}
 };
 
diff --git a/gfpcrypt.h b/gfpcrypt.h
index 7af993fb..321ac046 100644
--- a/gfpcrypt.h
+++ b/gfpcrypt.h
@@ -152,6 +152,7 @@ template <class T>
 class DL_Algorithm_GDSA : public DL_ElgamalLikeSignatureAlgorithm<T>
 {
 public:
+	virtual ~DL_Algorithm_GDSA() { }
 	static const char * CRYPTOPP_API StaticAlgorithmName() {return "DSA-1363";}
 
 	void Sign(const DL_GroupParameters<T> &params, const Integer &x, const Integer &k, const Integer &e, Integer &r, Integer &s) const
@@ -184,6 +185,7 @@ template <class T>
 class DL_Algorithm_NR : public DL_ElgamalLikeSignatureAlgorithm<T>
 {
 public:
+	virtual ~DL_Algorithm_NR() { }
 	static const char * CRYPTOPP_API StaticAlgorithmName() {return "NR";}
 
 	void Sign(const DL_GroupParameters<T> &params, const Integer &x, const Integer &k, const Integer &e, Integer &r, Integer &s) const
@@ -412,6 +414,7 @@ template <class MAC, bool DHAES_MODE>
 class DL_EncryptionAlgorithm_Xor : public DL_SymmetricEncryptionAlgorithm
 {
 public:
+	virtual ~DL_EncryptionAlgorithm_Xor() { }
 	bool ParameterSupported(const char *name) const {return strcmp(name, Name::EncodingParameters()) == 0;}
 	size_t GetSymmetricKeyLength(size_t plaintextLength) const
 		{return plaintextLength + MAC::DEFAULT_KEYLENGTH;}
@@ -488,6 +491,7 @@ template <class T, bool DHAES_MODE, class KDF>
 class DL_KeyDerivationAlgorithm_P1363 : public DL_KeyDerivationAlgorithm<T>
 {
 public:
+	virtual ~DL_KeyDerivationAlgorithm_P1363() { }
 	bool ParameterSupported(const char *name) const {return strcmp(name, Name::KeyDerivationParameters()) == 0;}
 	void Derive(const DL_GroupParameters<T> &params, byte *derivedKey, size_t derivedLength, const T &agreedElement, const T &ephemeralPublicKey, const NameValuePairs &parameters) const
 	{
diff --git a/luc.h b/luc.h
index 7a816843..b065b8ed 100644
--- a/luc.h
+++ b/luc.h
@@ -188,6 +188,7 @@ protected:
 class DL_Algorithm_LUC_HMP : public DL_ElgamalLikeSignatureAlgorithm<Integer>
 {
 public:
+	virtual ~DL_Algorithm_LUC_HMP() { }
 	static const char * StaticAlgorithmName() {return "LUC-HMP";}
 
 	void Sign(const DL_GroupParameters<Integer> &params, const Integer &x, const Integer &k, const Integer &e, Integer &r, Integer &s) const;
diff --git a/pubkey.h b/pubkey.h
index 3a3f3bcd..478097f5 100644
--- a/pubkey.h
+++ b/pubkey.h
@@ -1436,6 +1436,7 @@ class DL_KeyAgreementAlgorithm_DH : public DL_KeyAgreementAlgorithm<ELEMENT>
 public:
 	typedef ELEMENT Element;
 
+	virtual ~DL_KeyAgreementAlgorithm_DH() { }
 	static const char * CRYPTOPP_API StaticAlgorithmName()
 		{return COFACTOR_OPTION::ToEnum() == INCOMPATIBLE_COFACTOR_MULTIPLICTION ? "DHC" : "DH";}