diff --git a/netbox/ipam/api/views.py b/netbox/ipam/api/views.py
index c0ceaf10a7d..69ce4019ba8 100644
--- a/netbox/ipam/api/views.py
+++ b/netbox/ipam/api/views.py
@@ -392,7 +392,7 @@ def get(self, request, pk):
     @extend_schema(
         methods=["post"],
         responses={201: serializers.PrefixSerializer(many=True)},
-        request=serializers.PrefixSerializer(many=True),
+        request=serializers.PrefixLengthSerializer(many=True),
     )
     def post(self, request, pk):
         return super().post(request, pk)