1 files changed, 1 insertions, 1 deletions
diff --git a/app/ring.c b/app/ring.c
index 26bba3a..1f3ba4e 100644
--- a/app/ring.c
+++ b/app/ring.c
@@ -53,7 +53,7 @@ ring_read_byte (ring_t *r, uint8_t *c)
 }
 
 int
-ring_write (ring_t *r, uint8_t *buf, size_t len)
+ring_write (ring_t *r, const uint8_t *buf, size_t len)
 {
   while (len--) {
     if (ring_write_byte (r, * (buf++)))