diff --git a/drivers/ethos/ethos.c b/drivers/ethos/ethos.c
index 6408bc0c95..de636a422a 100644
--- a/drivers/ethos/ethos.c
+++ b/drivers/ethos/ethos.c
@@ -60,7 +60,7 @@ void ethos_setup(ethos_t *dev, const ethos_params_t *params)
     dev->last_framesize = 0;
     dev->accept_new = true;
 
-    tsrb_init(&dev->inbuf, (char*)params->buf, params->bufsize);
+    tsrb_init(&dev->inbuf, params->buf, params->bufsize);
     mutex_init(&dev->out_mutex);
 
     uint32_t a = random_uint32();
@@ -127,7 +127,7 @@ static void _end_of_frame(ethos_t *dev)
             /* fall through */
         case ETHOS_FRAME_TYPE_HELLO_REPLY:
             if (dev->framesize == 6) {
-                tsrb_get(&dev->inbuf, (char*)dev->remote_mac_addr, 6);
+                tsrb_get(&dev->inbuf, dev->remote_mac_addr, 6);
             }
             break;
     }