diff --git a/src/mkdocstrings_handlers/python/handler.py b/src/mkdocstrings_handlers/python/handler.py
index 71594968..169546fd 100644
--- a/src/mkdocstrings_handlers/python/handler.py
+++ b/src/mkdocstrings_handlers/python/handler.py
@@ -263,9 +263,9 @@ def collect(self, identifier: str, config: Mapping[str, Any]) -> CollectorItem:
         parser_name = final_config["docstring_style"]
         parser_options = final_config["docstring_options"]
         parser = parser_name and Parser(parser_name)
-        extensions = self.normalize_extension_paths(final_config.get("extensions", []))
 
         if unknown_module:
+            extensions = self.normalize_extension_paths(final_config.get("extensions", []))
             loader = GriffeLoader(
                 extensions=load_extensions(extensions),
                 search_paths=self._paths,