diff --git a/services/authenticators/src/account_related/auth/iso_auth_task/iso_auth_task_common.c b/services/authenticators/src/account_related/auth/iso_auth_task/iso_auth_task_common.c
index fa49ad9c745287686871991b42cd4636c4f30dcb..7ad5706a952f30ecb63c847584ae9a1b2d9fe321 100755
--- a/services/authenticators/src/account_related/auth/iso_auth_task/iso_auth_task_common.c
+++ b/services/authenticators/src/account_related/auth/iso_auth_task/iso_auth_task_common.c
@@ -156,11 +156,11 @@ static int32_t GenerateAuthTokenForAccessory(const IsoAuthParams *params, Uint8B
         LOGE("Malloc for authToken failed, res: %d.", res);
         return res;
     }
-    Uint8Buff userIdSelfBuff = {
-        .val = (uint8_t *)(params->userIdSelf),
-        .length = HcStrlen(params->userIdSelf)
+    Uint8Buff userIdPeerBuff = {
+        .val = (uint8_t *)(params->userIdPeer),
+        .length = HcStrlen(params->userIdPeer)
     };
-    res = params->isoBaseParams.loader->computeHkdf(&keyAlias, &userIdSelfBuff, &params->challenge, outKey, true);
+    res = params->isoBaseParams.loader->computeHkdf(&keyAlias, &userIdPeerBuff, &params->challenge, outKey, true);
     if (res != HC_SUCCESS) {
         LOGE("Failed to computeHkdf from authCode to authToken.");
         FreeAndCleanKey(outKey);