diff --git a/src/session/keys/SessionKey.ts b/src/session/keys/SessionKey.ts
index 40d9c17..2374511 100644
--- a/src/session/keys/SessionKey.ts
+++ b/src/session/keys/SessionKey.ts
@@ -8,5 +8,6 @@ export enum SessionKey {
     Hijacked = ".hijacked",
     OAuth2Nonce = ".oauth2_nonce",
     ZXSKey = ".zxs_key",
-    Pst = "pst"
+    Pst = "pst",
+    CsrfToken = "csrf_token"
 }
diff --git a/src/session/model/SessionInterfaces.ts b/src/session/model/SessionInterfaces.ts
index 49afe1c..1ed6520 100644
--- a/src/session/model/SessionInterfaces.ts
+++ b/src/session/model/SessionInterfaces.ts
@@ -15,7 +15,8 @@ export type ISession = {
     [SessionKey.LastAccess]?: number,
     [SessionKey.Pst]?: string,
     [SessionKey.SignInInfo]?: ISignInInfo,
-    [SessionKey.ExtraData]?: any
+    [SessionKey.ExtraData]?: any,
+    [SessionKey.CsrfToken]?: string
 };
 
 export type ISignInInfo = {