diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index a2b9f8cfe..04ce8f728 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -2258,7 +2258,7 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
     int ret;
     const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
         ssl->transform_negotiate->ciphersuite_info;
-    unsigned char *p, *end;
+    unsigned char *p = NULL, *end = NULL;
 
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );