diff --git a/lib/ansible/plugins/inventory/aws_ec2.py b/lib/ansible/plugins/inventory/aws_ec2.py
index 3ac5321c42..ae2ec90308 100644
--- a/lib/ansible/plugins/inventory/aws_ec2.py
+++ b/lib/ansible/plugins/inventory/aws_ec2.py
@@ -130,6 +130,12 @@ from ansible.module_utils.six import string_types
 from ansible.module_utils.ec2 import ansible_dict_to_boto3_filter_list, boto3_tag_list_to_ansible_dict
 from ansible.module_utils.ec2 import camel_dict_to_snake_dict
 from ansible.plugins.inventory import BaseInventoryPlugin, Constructable, Cacheable, to_safe_group_name
+try:
+    from __main__ import display
+except ImportError:
+    from ansible.utils.display import Display
+    display = Display()
+
 
 try:
     import boto3
@@ -502,6 +508,7 @@ class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
         if super(InventoryModule, self).verify_file(path):
             if path.endswith('.aws_ec2.yml') or path.endswith('.aws_ec2.yaml'):
                 return True
+        display.debug("aws_ec2 inventory filename must end with '*.aws_ec2.yml' or '*.aws_ec2.yaml'")
         return False
 
     def _get_query_options(self, config_data):