diff --git a/srsue/src/stack/upper/pcsc_usim.cc b/srsue/src/stack/upper/pcsc_usim.cc
index dfe1ada609d..cc355c91317 100644
--- a/srsue/src/stack/upper/pcsc_usim.cc
+++ b/srsue/src/stack/upper/pcsc_usim.cc
@@ -218,7 +218,7 @@ auth_result_t pcsc_usim::generate_authentication_response_5g(uint8_t*    rand,
   security_generate_k_seaf(k_ausf, serving_network_name, k_seaf);
   logger.debug(k_seaf, 32, "K SEAF");
   // Generate K_amf
-  security_generate_k_amf(k_ausf, imsi_str.c_str(), abba, abba_len, k_amf);
+  security_generate_k_amf(k_seaf, imsi_str.c_str(), abba, abba_len, k_amf);
   logger.debug(k_amf, 32, "K AMF");
 
   ret = AUTH_OK;