diff --git a/bankid/jsonclient.py b/bankid/jsonclient.py
index d14ad46..ff9e4ec 100644
--- a/bankid/jsonclient.py
+++ b/bankid/jsonclient.py
@@ -86,7 +86,7 @@ def sign_payload(
         requirement: Optional[Dict[str, Any]] = None,
         user_non_visible_data: Optional[str] = None,
         **kwargs,
-    ):
+    ) -> Dict[str, Any]:
         data = {"endUserIp": end_user_ip}
         if personal_number:
             data["personalNumber"] = personal_number