diff --git a/packages/histoire/src/client/app/codegen/serialize-js.ts b/packages/histoire/src/client/app/codegen/serialize-js.ts
index 768bbcc4..a580c449 100644
--- a/packages/histoire/src/client/app/codegen/serialize-js.ts
+++ b/packages/histoire/src/client/app/codegen/serialize-js.ts
@@ -32,7 +32,7 @@ export function serializeJs (value: any): string {
 }
 
 function printLines (lines: Line[]) {
-  return lines.map(line => ' '.repeat(line.spaces) + line.line).join('\n')
+  return lines.map(line => '  '.repeat(line.spaces) + line.line).join('\n')
 }
 
 function objectToSourceLines (object, indentCount = 0) {