diff --git a/moonraker/components/spoolman.py b/moonraker/components/spoolman.py
index fe987fc..c5b25ac 100644
--- a/moonraker/components/spoolman.py
+++ b/moonraker/components/spoolman.py
@@ -103,7 +103,8 @@ class SpoolManager:
     def _get_response_error(self, response: HttpResponse) -> str:
         err_msg = f"HTTP error: {response.status_code} {response.error}"
         try:
-            json_msg = response.json()["message"]
+            resp: Dict[str, Any] = response.json()
+            json_msg: str = resp["message"]
         except Exception:
             pass
         else: