diff --git a/devices/views.py b/devices/views.py
index bf9f4cb..c5e3add 100644
--- a/devices/views.py
+++ b/devices/views.py
@@ -30,11 +30,15 @@ class DeviceListCreateAPIView(
 
     def list(self, request, *args, **kwargs):
         queryset = self.filter_queryset(self.get_queryset())
-        all_devices = request.query_params.get("all_devices", None)
+        all_devices = request.query_params.get("all_devices", "false").lower() in [
+            "true",
+            "1",
+            "yes",
+        ]
         if (
             request.user.is_authenticated
-            and getattr(request.user, "is_admin", False)
-            and all_devices
+            and getattr(request.user, "is_admin")
+            and bool(all_devices)
         ):
             pass
         else: