diff --git a/tiny_gltf.h b/tiny_gltf.h
index d439746..fb2719b 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -4815,7 +4815,7 @@ bool TinyGLTF::WriteGltfSceneToFile(Model *model, const std::string &filename,
   if (writeBinary) {
     WriteBinaryGltfFile(filename, output.dump());
   } else {
-    WriteGltfFile(filename, output.dump(prettyPrint ? 2 : 0));
+    WriteGltfFile(filename, output.dump(prettyPrint ? 2 : -1));
   }
 
   return true;