diff --git a/fido2/ctap_parse.c b/fido2/ctap_parse.c
index 6cac59c..fbe3fc0 100644
--- a/fido2/ctap_parse.c
+++ b/fido2/ctap_parse.c
@@ -635,9 +635,9 @@ uint8_t ctap_parse_extensions(CborValue * val, CTAP_extensions * ext)
 {
     CborValue map;
     size_t sz, map_length;
-    uint8_t key[16];
-    uint8_t ret;
-    int i;
+    char key[16];
+    int ret;
+    unsigned int i;
     bool b;
 
     if (cbor_value_get_type(val) != CborMapType)
diff --git a/targets/stm32l432/src/redirect.c b/targets/stm32l432/src/redirect.c
index da8b19d..3eaf046 100644
--- a/targets/stm32l432/src/redirect.c
+++ b/targets/stm32l432/src/redirect.c
@@ -39,7 +39,7 @@ int _write (int fd, const void *buf, unsigned long int len)
 	// logbuflen += len;
 
 	// Send out USB serial
-	CDC_Transmit_FS(buf, len);
+	CDC_Transmit_FS(data, len);
 	// if (res == USBD_OK)
 	// 	logbuflen = 0;
 #endif