diff --git a/api/libretimeapi/views.py b/api/libretimeapi/views.py
index 1863af685..e42cf59f9 100644
--- a/api/libretimeapi/views.py
+++ b/api/libretimeapi/views.py
@@ -149,7 +149,7 @@ class ScheduleViewSet(viewsets.ModelViewSet):
         filter_valid = self.request.query_params.get("is_valid")
         if filter_valid is None:
             return self.queryset.all()
-        filter_valid = filter_valid.strip().lower() in ["true", "yes", "1"]
+        filter_valid = filter_valid.strip().lower() in ("true", "yes", "1")
         if filter_valid:
             return self.queryset.filter(starts__lt=F("instance__ends"))
         else: