diff --git a/src/hardware/dreamsourcelab-dslogic/protocol.c b/src/hardware/dreamsourcelab-dslogic/protocol.c
index 90b773d9..863b4e3b 100644
--- a/src/hardware/dreamsourcelab-dslogic/protocol.c
+++ b/src/hardware/dreamsourcelab-dslogic/protocol.c
@@ -914,6 +914,8 @@ static size_t get_buffer_size(const struct sr_dev_inst *sdi)
 	 */
 	const size_t block_size = enabled_channel_count(sdi) * 512;
 	const size_t s = 10 * to_bytes_per_ms(sdi);
+	if (!block_size)
+		return s;
 	return ((s + block_size - 1) / block_size) * block_size;
 }