diff --git a/builtin/providers/aws/resource_aws_instance.go b/builtin/providers/aws/resource_aws_instance.go
index 42656214f..c9074fb5b 100644
--- a/builtin/providers/aws/resource_aws_instance.go
+++ b/builtin/providers/aws/resource_aws_instance.go
@@ -85,6 +85,7 @@ func resourceAwsInstance() *schema.Resource {
 			"source_dest_check": &schema.Schema{
 				Type:     schema.TypeBool,
 				Optional: true,
+				Default:  true,
 			},
 
 			"user_data": &schema.Schema{
diff --git a/builtin/providers/aws/resource_aws_instance_test.go b/builtin/providers/aws/resource_aws_instance_test.go
index 253632a9a..9e443bd96 100644
--- a/builtin/providers/aws/resource_aws_instance_test.go
+++ b/builtin/providers/aws/resource_aws_instance_test.go
@@ -653,7 +653,6 @@ resource "aws_instance" "foo" {
 	ami = "ami-4fccb37f"
 	instance_type = "m1.small"
 	subnet_id = "${aws_subnet.foo.id}"
-	source_dest_check = true
 }
 `