diff --git a/src/ecdh_crypto.c b/src/ecdh_crypto.c
index 817f066a..603c293b 100644
--- a/src/ecdh_crypto.c
+++ b/src/ecdh_crypto.c
@@ -397,6 +397,7 @@ int ecdh_build_k(ssh_session session)
                     "Could not derive shared key: %s",
                     ERR_error_string(ERR_get_error(), NULL));
       EVP_PKEY_CTX_free(dh_ctx);
+      free(secret);
       return -1;
   }