diff --git a/src/llc.h b/src/llc.h
index 1f0c114..f82c4ed 100644
--- a/src/llc.h
+++ b/src/llc.h
@@ -38,6 +38,7 @@
 	struct msgb *dequeue();
 
 	void put_frame(const uint8_t *data, size_t len);
+	void put_dummy_frame(size_t req_len);
 	void append_frame(const uint8_t *data, size_t len);
 
 	void consume(size_t len);