diff --git a/builtin/providers/aws/resource_aws_autoscaling_group.go b/builtin/providers/aws/resource_aws_autoscaling_group.go
index b74b2b6cc..6c2716b54 100644
--- a/builtin/providers/aws/resource_aws_autoscaling_group.go
+++ b/builtin/providers/aws/resource_aws_autoscaling_group.go
@@ -96,10 +96,8 @@ func resourceAwsAutoscalingGroup() *schema.Resource {
 			},
 
 			"placement_group": &schema.Schema{
-				Type:     schema.TypeSet,
+				Type:     schema.TypeString,
 				Optional: true,
-				Elem:     &schema.Schema{Type: schema.TypeString},
-				Set:      schema.HashString,
 			},
 
 			"load_balancers": &schema.Schema{