diff --git a/cloud/ec2_asg b/cloud/ec2_asg
index 6528d951180..971a2a8c728 100644
--- a/cloud/ec2_asg
+++ b/cloud/ec2_asg
@@ -40,7 +40,7 @@ options:
   availability_zones:
     description:
       - List of availability zone names in which to create the group.
-    required: false
+    required: true
   launch_config_name:
     description:
       - Name of the Launch configuration to use for the group. See the ec2_lc module for managing these.