diff --git a/sys/net/if_types.h b/sys/net/if_types.h
--- a/sys/net/if_types.h
+++ b/sys/net/if_types.h
@@ -254,6 +254,7 @@
 	IFT_PFLOG	= 0xf6,		/* PF packet filter logging */
 	IFT_PFSYNC	= 0xf7,		/* PF packet filter synchronization */
 	IFT_WIREGUARD	= 0xf8,		/* WireGuard tunnel */
+	IFT_MBIM	= 0xf9,		/* Mobile Broadband Interface Model */
 } ifType;
 
 /*