diff --git a/lib/ansible/plugins/__init__.py b/lib/ansible/plugins/__init__.py
index f5a6f112a8..77033d8565 100644
--- a/lib/ansible/plugins/__init__.py
+++ b/lib/ansible/plugins/__init__.py
@@ -219,6 +219,7 @@ class PluginLoader:
             if directory not in self._extra_dirs:
                 # append the directory and invalidate the path cache
                 self._extra_dirs.append(directory)
+                self._plugin_path_cache.clear()
                 self._paths = None
 
     def find_plugin(self, name, mod_type=''):