diff --git a/openair-cn/NAS/EURECOM-NAS/src/api/usim/aka_functions.c b/openair-cn/NAS/EURECOM-NAS/src/api/usim/aka_functions.c
index 156e5abffd..70f02469ee 100644
--- a/openair-cn/NAS/EURECOM-NAS/src/api/usim/aka_functions.c
+++ b/openair-cn/NAS/EURECOM-NAS/src/api/usim/aka_functions.c
@@ -19,8 +19,9 @@
 
 /*--------- Operator Variant Algorithm Configuration Field --------*/
             /*------- Insert your value of OP here -------*/
-u8 OP[16] = {0x63, 0xbf, 0xa5, 0x0e, 0xe6, 0x52, 0x33, 0x65,
-             0xff, 0x14, 0xc1, 0xf4, 0x5f, 0x88, 0x73, 0x7d};
+/* PFT OP used currently in HSS (OPENAIRHSS/auc/kdf.c) */
+u8 OP[16] = {0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11,
+             0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, 0x11};
             /*------- Insert your value of OP here -------*/
 
 /*-------------------------------------------------------------------