diff --git a/app/network/views.py b/app/network/views.py
index e6cc053c2e607cd3c2eb523330b2f36776555c3e..4f639defe7df0a41ecd9020b861c2cf0ec34c7c5 100644
--- a/app/network/views.py
+++ b/app/network/views.py
@@ -175,6 +175,12 @@ def edit_interface(name):
     ips = [interface.ip]
     ips.extend([str(address) for address in interface.network.available_ips()])
     form.ip.choices = utils.get_choices(ips)
+    # Passing tags as kwarg to the InterfaceForm doesn't work because
+    # obj takes precedence (but interface.tags contain Tag instances and not id)
+    # We need to update the default values. Calling process is required.
+    # See https://stackoverflow.com/questions/5519729/wtforms-how-to-select-options-in-selectmultiplefield
+    form.tags.default = [tag.id for tag in interface.tags]
+    form.tags.process(request.form)
     if form.validate_on_submit():
         interface.name = form.interface_name.data
         interface.ip = form.ip.data