diff --git a/src/lib/ObjectWriter.ts b/src/lib/ObjectWriter.ts
index 9b2689c0..a74b8701 100644
--- a/src/lib/ObjectWriter.ts
+++ b/src/lib/ObjectWriter.ts
@@ -38,9 +38,9 @@ export class ObjectWriter<T extends Obj = Obj> extends AbstractReadWriter {
     //tslint:disable:no-unbound-method no-magic-numbers
     switch (this.format) {
       case ObjectWriterFormat.YAML:
-        return YAML.stringify.bind(YAML);
+        return (v$: T) => YAML.stringify(v$, Number.MAX_VALUE, 2);
       default:
-        return (v: T) => JSON.stringify(v, null, 2);
+        return (v$: T) => JSON.stringify(v$, null, 2);
     }
     //tslint:enable:no-unbound-method no-magic-numbers
   }
diff --git a/test/commands/copy-files.ts b/test/commands/copy-files.ts
index 149cdf63..27daa9d5 100644
--- a/test/commands/copy-files.ts
+++ b/test/commands/copy-files.ts
@@ -115,7 +115,8 @@ describe('copy-files', () => {
             break;
           case '.yml':
           case '.yaml':
-            contents = YAML.stringify(cfg);
+            //tslint:disable-next-line:no-magic-numbers
+            contents = YAML.stringify(cfg, Number.MAX_VALUE, 2);
             break;
           default:
             throw new Error('Test error: invalid format');