diff --git a/src/c3nav/editor/views/edit.py b/src/c3nav/editor/views/edit.py
index cd36af04..dd08479f 100644
--- a/src/c3nav/editor/views/edit.py
+++ b/src/c3nav/editor/views/edit.py
@@ -337,7 +337,7 @@ def edit(request, pk=None, model=None, level=None, space=None, on_top_of=None, e
 
         json_body = getattr(request, 'json_body', None)
         data = json_body if json_body is not None else request.POST
-        form = model.EditorForm(instance=model() if new else obj, data=data, is_json=True,
+        form = model.EditorForm(instance=model() if new else obj, data=data, is_json=json_body is not None,
                                 request=request, space_id=space_id, force_geometry_editable=force_geometry_editable)
         if form.is_valid():
             # Update/create objects