diff --git a/include/ardix/ringbuf.h b/include/ardix/ringbuf.h
index d37aed8..a2cd0bd 100644
--- a/include/ardix/ringbuf.h
+++ b/include/ardix/ringbuf.h
@@ -18,7 +18,7 @@ struct ringbuf {
  * @param size: Total buffer size in bytes.
  * @returns The newly allocated buffer, or `NULL` if OOM.
  */
-struct ringbuf *rungbuf_create(size_t size);
+struct ringbuf *ringbuf_create(size_t size);
 
 /**
  * Destroy a ring buffer previously created with `ringbuf_create`.
diff --git a/kernel/ringbuf.c b/kernel/ringbuf.c
index 80bedb3..7ee26a0 100644
--- a/kernel/ringbuf.c
+++ b/kernel/ringbuf.c
@@ -34,26 +34,26 @@ size_t ringbuf_read(uint8_t *dest, struct ringbuf *buf, size_t len)
 		*tmp++ = buf->data[buf->rpos++];
 
 		/* wrap around */
-		if (buf->rpos = buf->size)
+		if (buf->rpos == buf->size)
 			buf->rpos = 0;
 	}
 
-	return tmp - dest;
+	return (size_t)tmp - (size_t)dest;
 }
 
 size_t ringbuf_write(struct ringbuf *buf, const uint8_t *src, size_t len)
 {
-	uint8_t *tmp = src;
+	const uint8_t *tmp = src;
 
 	while (len-- > 0 && buf->wpos != buf->rpos) {
 		buf->data[buf->wpos++] = *tmp++;
 
 		/* wrap around */
-		if (buf->wpos = buf->size)
+		if (buf->wpos == buf->size)
 			buf->wpos = 0;
 	}
 
-	return tmp - src;
+	return (size_t)tmp - (size_t)src;
 }
 
 size_t ringbuf_size(struct ringbuf *buf)