diff --git a/lib/gssapi/mech/gssapi.asn1 b/lib/gssapi/mech/gssapi.asn1
index 6fd508995..74207ed15 100644
--- a/lib/gssapi/mech/gssapi.asn1
+++ b/lib/gssapi/mech/gssapi.asn1
@@ -4,7 +4,7 @@ GSS-API DEFINITIONS ::= BEGIN
 
 IMPORTS heim_any FROM heim;
 
-GSSAPIContextToken ::= [APPLICATION 0] SEQUENCE {
+GSSAPIContextToken ::= [APPLICATION 0] IMPLICIT SEQUENCE {
 	thisMech OBJECT IDENTIFIER,
 	innerContextToken heim_any
 }