diff --git a/netbox_devices.go b/netbox_devices.go
index dcbc704..a2868f6 100644
--- a/netbox_devices.go
+++ b/netbox_devices.go
@@ -158,7 +158,7 @@ type DeviceFilter struct {
 	Q                   string `schema:"q,omitempty"`
 	ManufacturerId      string `schema:"manufacturer_id,omitempty"`
 	Manufacturer        string `schema:"manufacturer,omitempty"`
-	DeviceTypeId        string `schema:"device_type_id"`
+	DeviceTypeId        string `schema:"device_type_id,omitempty"`
 	RoleId              string `schema:"role_id,omitempty"`
 	Role                string `schema:"role,omitempty"`
 	RegionId            string `schema:"region_id,omitempty"`