diff --git a/src/index.tsx b/src/index.tsx
index d30c6ed8..0dbd2fd1 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -117,7 +117,9 @@ export type IntercomType = {
    * Valid identifiers are `userId` and `email` which must be set in the {@link UserAttributes} object.
    * @param params The {@link UserAttributes} object that contains the user's `email` or `userId`.
    */
-  loginUserWithUserAttributes: (params: UserAttributes) => Promise<boolean>;
+  loginUserWithUserAttributes: (
+    params: Pick<UserAttributes, 'email' | 'userId'>
+  ) => Promise<boolean>;
 
   /**
    * Log a user out of their Intercom session.