--- a/contrib/automation/hgautomation/aws.py	Fri Apr 19 05:07:44 2019 -0700
+++ b/contrib/automation/hgautomation/aws.py	Fri Apr 19 05:15:43 2019 -0700
@@ -505,6 +505,10 @@
 
     for role in iamresource.roles.all():
         if role.name.startswith(prefix):
+            for p in role.attached_policies.all():
+                print('detaching policy %s from %s' % (p.arn, role.name))
+                role.detach_policy(PolicyArn=p.arn)
+
             print('removing role %s' % role.name)
             role.delete()