diff --git a/service/http.go b/service/http.go
index c05bea73..cb11e7df 100644
--- a/service/http.go
+++ b/service/http.go
@@ -51,7 +51,7 @@ func SPNEGOKRB5Authenticate(f http.Handler, kt keytab.Keytab, sa string, l *log.
 			rejectSPNEGO(w, l, fmt.Sprintf("%v - SPNEGO negotiation token is not a NegTokenInit: %v", r.RemoteAddr, err))
 			return
 		}
-		if !spnego.NegTokenInit.MechTypes[0].Equal(gssapi.MechTypeOIDKRB5) {
+		if !spnego.NegTokenInit.MechTypes[0].Equal(gssapi.MechTypeOIDKRB5) && !spnego.NegTokenInit.MechTypes[0].Equal(gssapi.MechTypeOIDMSLegacyKRB5) {
 			rejectSPNEGO(w, l, fmt.Sprintf("%v - SPNEGO OID of MechToken is not of type KRB5", r.RemoteAddr))
 			return
 		}