diff --git a/lib/kadm5/admin.h b/lib/kadm5/admin.h
index c26afd0f1..f0f1f559d 100644
--- a/lib/kadm5/admin.h
+++ b/lib/kadm5/admin.h
@@ -124,6 +124,7 @@ typedef struct _krb5_tl_data {
 #define KRB5_TL_SECURID_STATE           0x0006
 #define KRB5_TL_PASSWORD           	0x0007
 #define KRB5_TL_EXTENSION           	0x0008
+#define KRB5_TL_PKINIT_ACL           	0x0009
 
 typedef struct _kadm5_principal_ent_t {
     krb5_principal principal;