diff --git a/lib/terraforming/resource/efs.rb b/lib/terraforming/resource/efs.rb
index <HASH>..<HASH> 100644
--- a/lib/terraforming/resource/efs.rb
+++ b/lib/terraforming/resource/efs.rb
@@ -29,7 +29,7 @@ module Terraforming
             "tags.Name" => efs.name,
           }
 
-          resources[format('%s',efs.file_system_id)] = {
+          resources[format('%s', efs.file_system_id)] = {
             "type" => "aws_efs_file_system",
             "depends_on" => [],
             "primary" => {
add comma in format() for second argument.