diff --git a/Disco.Web/Areas/Config/Models/DeviceBatch/IndexModel.cs b/Disco.Web/Areas/Config/Models/DeviceBatch/IndexModel.cs
index 45b0fc80..49d2147d 100644
--- a/Disco.Web/Areas/Config/Models/DeviceBatch/IndexModel.cs
+++ b/Disco.Web/Areas/Config/Models/DeviceBatch/IndexModel.cs
@@ -26,7 +26,7 @@ namespace Disco.Web.Areas.Config.Models.DeviceBatch
                 WarrantyExpires = db.WarrantyValidUntil,
                 InsuranceSupplier = db.InsuranceSupplier,
                 InsuredUntil = db.InsuredUntil
-            }).Cast<ConfigDeviceBatchIndexModelItem>().ToList();
+            }).ToArray().Cast<ConfigDeviceBatchIndexModelItem>().ToList();
 
             return m;
         }
diff --git a/Disco.Web/Areas/Config/Models/DeviceProfile/IndexModel.cs b/Disco.Web/Areas/Config/Models/DeviceProfile/IndexModel.cs
index c6924cc3..dd749253 100644
--- a/Disco.Web/Areas/Config/Models/DeviceProfile/IndexModel.cs
+++ b/Disco.Web/Areas/Config/Models/DeviceProfile/IndexModel.cs
@@ -25,7 +25,7 @@ namespace Disco.Web.Areas.Config.Models.DeviceProfile
                 DistributionTypeId = dp.DistributionTypeDb,
                 DeviceCount = dp.Devices.Count,
                 DeviceDecommissionedCount = dp.Devices.Count(d => d.DecommissionedDate.HasValue)
-            }).Cast<ConfigDeviceProfileIndexModelItem>().ToList();
+            }).ToArray().Cast<ConfigDeviceProfileIndexModelItem>().ToList();
 
             if (DiscoApplication.MultiSiteMode)
             {