diff --git a/sphinxarg/ext.py b/sphinxarg/ext.py
index ed2a3897..89a08281 100644
--- a/sphinxarg/ext.py
+++ b/sphinxarg/ext.py
@@ -113,7 +113,9 @@ def print_action_groups(
             # Every action group is composed of a section, holding
             # a title, the description, and the option group (members)
             title_as_id = action_group['title'].replace(' ', '-').lower()
-            section = nodes.section(ids=[f'{id_prefix}-{title_as_id}'])
+            if id_prefix:
+                title_as_id = f'{id_prefix}-{title_as_id}'
+            section = nodes.section(ids=[title_as_id])
             section += nodes.title(action_group['title'], action_group['title'])
 
             desc = []
@@ -575,7 +577,7 @@ def run(self):
                 nested_content,
                 markdown_help,
                 settings=self.state.document.settings,
-                id_prefix=(f'{module_name}-' if module_name else '') + attr_name,
+                id_prefix=f'{module_name}-{attr_name}' if module_name else attr_name,
             )
         )
         if 'nosubcommands' not in self.options:
diff --git a/test/test_default_html.py b/test/test_default_html.py
index e5acd7f7..9ff62b6f 100644
--- a/test/test_default_html.py
+++ b/test/test_default_html.py
@@ -56,12 +56,12 @@ def get_text(node):
                 ('.//h1', 'blah-blah', False),
                 (".//div[@class='highlight']//span", 'usage'),
                 ('.//h2', 'Positional Arguments'),
-                (".//section[@id='positional-arguments']", ''),
-                (".//section[@id='positional-arguments']/dl/dt[1]/kbd", 'foo2 metavar'),
-                (".//section[@id='named-arguments']", ''),
-                (".//section[@id='named-arguments']/dl/dt[1]/kbd", '--foo'),
-                (".//section[@id='bar-options']", ''),
-                (".//section[@id='bar-options']/dl/dt[1]/kbd", '--bar'),
+                (".//section[@id='get_parser-positional-arguments']", ''),
+                (".//section[@id='get_parser-positional-arguments']/dl/dt[1]/kbd", 'foo2 metavar'),
+                (".//section[@id='get_parser-named-arguments']", ''),
+                (".//section[@id='get_parser-named-arguments']/dl/dt[1]/kbd", '--foo'),
+                (".//section[@id='get_parser-bar-options']", ''),
+                (".//section[@id='get_parser-bar-options']/dl/dt[1]/kbd", '--bar'),
             ],
         ),
         (
@@ -71,8 +71,8 @@ def get_text(node):
                 ('.//h1', 'Command A'),
                 (".//div[@class='highlight']//span", 'usage'),
                 ('.//h2', 'Positional Arguments'),
-                (".//section[@id='positional-arguments']", ''),
-                (".//section[@id='positional-arguments']/dl/dt[1]/kbd", 'baz'),
+                (".//section[@id='get_parser-positional-arguments']", ''),
+                (".//section[@id='get_parser-positional-arguments']/dl/dt[1]/kbd", 'baz'),
             ],
         ),
         (