diff --git a/src/wrapper.c b/src/wrapper.c
index 7e57ab5d..06fbe5f9 100644
--- a/src/wrapper.c
+++ b/src/wrapper.c
@@ -182,6 +182,7 @@ void crypto_free(struct ssh_crypto_struct *crypto)
         crypto->ecdh_privkey = NULL;
     }
 #endif
+    SAFE_FREE(crypto->dh_server_signature);
     if (crypto->session_id != NULL) {
         explicit_bzero(crypto->session_id, crypto->digest_len);
         SAFE_FREE(crypto->session_id);