diff --git a/src/ssl.c b/src/ssl.c
index 783689da9..ad120b1a9 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -35848,6 +35848,7 @@ int wolfSSL_i2d_RSAPrivateKey(WOLFSSL_RSA *rsa, unsigned char **pp)
             /* create buffer and return it */
             *pp = (unsigned char*)XMALLOC(ret, NULL, DYNAMIC_TYPE_OPENSSL);
             if (*pp == NULL) {
+                XFREE(der, NULL, DYNAMIC_TYPE_TMP_BUFFER);
                 return WOLFSSL_FATAL_ERROR;
             }
             XMEMCPY(*pp, der, ret);