diff --git a/actions/sharing b/actions/sharing
index d5fc0f6da..d40bd6319 100755
--- a/actions/sharing
+++ b/actions/sharing
@@ -43,8 +43,9 @@ def parse_arguments():
     add_parser.add_argument('--path', required=True, help='Disk path to share')
     add_parser.add_argument('--groups', nargs='*',
                             help='List of groups that can access the share')
-    add_parser.add_argument('--is-public', default=False, required=False,
-                            help='1 if public share else 0')
+    add_parser.add_argument('--is-public', required=False, default=False,
+                            action="store_true",
+                            help='Allow public access to this share')
 
     remove_parser = subparsers.add_parser('remove',
                                           help='Remove an existing share')
@@ -94,7 +95,7 @@ def subcommand_add(arguments):
     aug.set('$conf/Location[last()]/directive[last()]/arg',
             'includes/freedombox-sharing.conf')
 
-    if is_public != "true":
+    if not is_public:
         aug.set('$conf/Location[last()]/directive[last() + 1]', 'Include')
         aug.set('$conf/Location[last()]/directive[last()]/arg',
                 'includes/freedombox-single-sign-on.conf')
diff --git a/plinth/modules/sharing/__init__.py b/plinth/modules/sharing/__init__.py
index 843bce10a..a6de7ac6a 100644
--- a/plinth/modules/sharing/__init__.py
+++ b/plinth/modules/sharing/__init__.py
@@ -71,10 +71,10 @@ def list_shares():
 
 def add_share(name, path, groups, is_public):
     """Add a new share by called the action script."""
-    actions.superuser_run('sharing', [
-        'add', '--name', name, '--path', path, '--is-public', is_public,
-        '--groups'
-    ] + groups)
+    args = ['add', '--name', name, '--path', path, '--groups'] + groups
+    if is_public:
+        args.append('--is-public')
+    actions.superuser_run('sharing', args)
 
 
 def remove_share(name):
diff --git a/plinth/modules/sharing/views.py b/plinth/modules/sharing/views.py
index 9d4fcfc8f..48b7ddf64 100644
--- a/plinth/modules/sharing/views.py
+++ b/plinth/modules/sharing/views.py
@@ -61,9 +61,7 @@ class AddShareView(SuccessMessageMixin, FormView):
 
     def form_valid(self, form):
         """Add the share on valid form submission."""
-        data = form.cleaned_data
-        sharing.add_share(data['name'], data['path'], data['groups'],
-                          str(data['is_public']).lower())
+        _add_share(form.cleaned_data)
         return super().form_valid(form)
 
 
@@ -95,13 +93,16 @@ class EditShareView(SuccessMessageMixin, FormView):
         """Add the share on valid form submission."""
         if form.initial != form.cleaned_data:
             sharing.remove_share(form.initial['name'])
-            data = form.cleaned_data
-            sharing.add_share(data['name'], data['path'], data['groups'],
-                              str(data['is_public']).lower())
+            _add_share(form.cleaned_data)
 
         return super().form_valid(form)
 
 
+def _add_share(form_data):
+    sharing.add_share(form_data['name'], form_data['path'],
+                      form_data['groups'], form_data['is_public'])
+
+
 @require_POST
 def remove(request, name):
     """View to remove a share."""