diff --git a/lib/ansible/module_utils/ec2.py b/lib/ansible/module_utils/ec2.py
index 7b93d9bb7e0..a360c2e6721 100644
--- a/lib/ansible/module_utils/ec2.py
+++ b/lib/ansible/module_utils/ec2.py
@@ -153,6 +153,8 @@ def get_aws_connection_info(module, boto3=False):
     if not security_token:
         if 'AWS_SECURITY_TOKEN' in os.environ:
             security_token = os.environ['AWS_SECURITY_TOKEN']
+        elif 'AWS_SESSION_TOKEN' in os.environ:
+            security_token = os.environ['AWS_SESSION_TOKEN']
         elif 'EC2_SECURITY_TOKEN' in os.environ:
             security_token = os.environ['EC2_SECURITY_TOKEN']
         else: