2 files changed, 6 insertions, 1 deletions
diff --git a/src/block/serpent/serpent.cpp b/src/block/serpent/serpent.cpp
index 0f0a4fd63..8c83b69de 100644
--- a/src/block/serpent/serpent.cpp
+++ b/src/block/serpent/serpent.cpp
@@ -391,4 +391,9 @@ void Serpent::key_schedule(const byte key[], size_t length)
    round_key.assign(&W[8], &W[140]);
    }
 
+void Serpent::clear()
+   {
+   zap(round_key);
+   }
+
 }
diff --git a/src/block/serpent/serpent.h b/src/block/serpent/serpent.h
index 9266ccef8..dc539c9f3 100644
--- a/src/block/serpent/serpent.h
+++ b/src/block/serpent/serpent.h
@@ -21,7 +21,7 @@ class BOTAN_DLL Serpent : public Block_Cipher_Fixed_Params<16, 16, 32, 8>
       void encrypt_n(const byte in[], byte out[], size_t blocks) const;
       void decrypt_n(const byte in[], byte out[], size_t blocks) const;
 
-      void clear() { round_key.clear(); }
+      void clear();
       std::string name() const { return "Serpent"; }
       BlockCipher* clone() const { return new Serpent; }
    protected: