diff --git a/packages/plugin-scalebox/src/index.js b/packages/plugin-scalebox/src/index.js
index 83701554227..c861151f502 100644
--- a/packages/plugin-scalebox/src/index.js
+++ b/packages/plugin-scalebox/src/index.js
@@ -5,7 +5,7 @@ export default {
   version: version,
   hooks: {
     preRender: function(svg) {
-      svg.attributes.add("freesewing:plugin-scalebox", version);
+      svg.attributes.set("freesewing:plugin-scalebox", version);
     }
   },
   macros: {