diff --git a/clatd.c b/clatd.c
index 7cee4e8..9a7a45a 100644
--- a/clatd.c
+++ b/clatd.c
@@ -49,9 +49,6 @@
 
 struct clat_config Global_Clatd_Config;
 
-/* 40 bytes IPv6 header - 20 bytes IPv4 header + 8 bytes fragment header */
-#define MTU_DELTA 28
-
 volatile sig_atomic_t running = 1;
 
 // reads IPv6 packet from AF_PACKET socket, translates to IPv4, writes to tun