diff --git a/netbox/dcim/forms/filtersets.py b/netbox/dcim/forms/filtersets.py
index 98f1e9529..d8d326271 100644
--- a/netbox/dcim/forms/filtersets.py
+++ b/netbox/dcim/forms/filtersets.py
@@ -979,6 +979,7 @@ class CableFilterForm(TenancyFilterForm, NetBoxModelFilterSetForm):
     )
     length = forms.DecimalField(
         label=_('Length'),
+        required=False,
     )
     length_unit = forms.ChoiceField(
         label=_('Length unit'),