diff --git a/src/ssl.c b/src/ssl.c
index fc65e21e8..5b449fb5b 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -24579,7 +24579,8 @@ int wolfSSL_HMAC_Final(WOLFSSL_HMAC_CTX* ctx, unsigned char* hash,
 
     WOLFSSL_MSG("wolfSSL_HMAC_Final");
 
-    if (ctx == NULL || hash == NULL || len == NULL) {
+	/* "len" parameter is optional. */
+    if (ctx == NULL || hash == NULL) {
         WOLFSSL_MSG("invalid parameter");
         return WOLFSSL_FAILURE;
     }