diff --git a/moonraker/components/spool_manager.py b/moonraker/components/spool_manager.py
index c5e66948b..f4d96845d 100644
--- a/moonraker/components/spool_manager.py
+++ b/moonraker/components/spool_manager.py
@@ -151,7 +151,7 @@ def find_all_spools(self, show_inactive: bool) -> List[dict]:
         if not show_inactive:
             spools = {k: v for k, v in spools if v['active'] is True}
 
-        return spools
+        return dict(spools)
 
     def track_filament_usage(self, job_id: str, used_length: float):
         spool_id = self.get_active_spool_id()