diff --git a/src/eap.h b/src/eap.h
index c342e1fa..15c17fa7 100644
--- a/src/eap.h
+++ b/src/eap.h
@@ -75,6 +75,7 @@ enum eap_type {
 	EAP_TYPE_NAK		= 3,
 	__EAP_TYPE_MIN_METHOD	= 4,
 	EAP_TYPE_MD5_CHALLENGE	= 4,
+	EAP_TYPE_GTC		= 6,
 	EAP_TYPE_TLS_EAP	= 13,
 	EAP_TYPE_SIM		= 18,
 	EAP_TYPE_TTLS		= 21,