diff --git a/builtin/providers/aws/resource_aws_route_table.go b/builtin/providers/aws/resource_aws_route_table.go
index 64e59bbc8..f213f2241 100644
--- a/builtin/providers/aws/resource_aws_route_table.go
+++ b/builtin/providers/aws/resource_aws_route_table.go
@@ -97,6 +97,7 @@ func resource_aws_route_table_diff(
 	b := &diff.ResourceBuilder{
 		Attrs: map[string]diff.AttrType{
 			"vpc_id": diff.AttrTypeCreate,
+			"route":  diff.AttrTypeUpdate,
 		},
 	}
 
diff --git a/builtin/providers/aws/resources.go b/builtin/providers/aws/resources.go
index 7b48dec7b..018fd1fb0 100644
--- a/builtin/providers/aws/resources.go
+++ b/builtin/providers/aws/resources.go
@@ -43,7 +43,13 @@ func init() {
 
 			"aws_route_table": resource.Resource{
 				ConfigValidator: &config.Validator{
-					Required: []string{"vpc_id"},
+					Required: []string{
+						"vpc_id",
+						"route.*.cidr_block",
+					},
+					Optional: []string{
+						"route.*.gateway_id",
+					}
 				},
 				Create:  resource_aws_route_table_create,
 				Destroy: resource_aws_route_table_destroy,