diff --git a/include/patty/kiss/tnc.h b/include/patty/kiss/tnc.h
index 5c4c715..24ee8b8 100644
--- a/include/patty/kiss/tnc.h
+++ b/include/patty/kiss/tnc.h
@@ -37,8 +37,6 @@ int patty_kiss_tnc_fd(patty_kiss_tnc *tnc);
 
 void patty_kiss_tnc_destroy(patty_kiss_tnc *tnc);
 
-size_t patty_kiss_tnc_dropped(patty_kiss_tnc *tnc);
-
 int patty_kiss_tnc_pending(patty_kiss_tnc *tnc);
 
 ssize_t patty_kiss_tnc_fill(patty_kiss_tnc *tnc);