diff --git a/proto/c2se/backend/identity.proto b/proto/c2se/backend/identity.proto
index 3f7bf24..0765455 100644
--- a/proto/c2se/backend/identity.proto
+++ b/proto/c2se/backend/identity.proto
@@ -14,7 +14,7 @@ message SigninRequest {
 
 message SigninResponse {
   message Result {
-    string session_id = 1;
+    string access_token = 1;
   }
   optional bet.protobuf.rpc.Error error = 1;
   optional Result result = 2;
diff --git a/proto/c2se/frontend/identity.proto b/proto/c2se/frontend/identity.proto
index 6630427..d938a34 100644
--- a/proto/c2se/frontend/identity.proto
+++ b/proto/c2se/frontend/identity.proto
@@ -14,7 +14,7 @@ message SigninRequest {
 
 message SigninResponse {
   message Result {
-    string session_id = 1;
+    string access_token = 1;
   }
   optional bet.protobuf.rpc.Error error = 1;
   optional Result result = 2;
diff --git a/proto/ss/member/identity.proto b/proto/ss/member/identity.proto
index c730c2e..1305c48 100644
--- a/proto/ss/member/identity.proto
+++ b/proto/ss/member/identity.proto
@@ -60,7 +60,7 @@ message SigninRequest {
 
 message SigninResponse {
   message Result {
-    string session_id = 1;
+    string access_token = 1;
   }
   optional bet.protobuf.rpc.Error error = 1;
   optional Result result = 2;