diff --git a/fido2/ctap.c b/fido2/ctap.c
index 9ef99ad..7b506ed 100644
--- a/fido2/ctap.c
+++ b/fido2/ctap.c
@@ -386,7 +386,6 @@ static int ctap_make_extensions(CTAP_extensions * ext, uint8_t * ext_encoder_buf
         cbor_encoder_init(&extensions, ext_encoder_buf, *ext_encoder_buf_size, 0);
         printf1(TAG_GREEN, "have %d bytes for Extenstions encoder\r\n",*ext_encoder_buf_size);
         CborEncoder ext_map;
-        CborEncoder hmac_secret_map;
         ret = cbor_encoder_create_map(&extensions, &ext_map, 1);
         check_ret(ret);
         {
@@ -1088,7 +1087,7 @@ uint8_t ctap_get_next_assertion(CborEncoder * encoder)
 uint8_t ctap_get_assertion(CborEncoder * encoder, uint8_t * request, int length)
 {
     CTAP_getAssertion GA;
-    uint8_t auth_data_buf[sizeof(CTAP_authDataHeader) + 128];
+    uint8_t auth_data_buf[sizeof(CTAP_authDataHeader) + 100];
     int ret = ctap_parse_get_assertion(&GA,request,length);
 
     if (ret != 0)