diff --git a/Gulpfile.js b/Gulpfile.js
index 5f0b03c04b..d85ea54c15 100644
--- a/Gulpfile.js
+++ b/Gulpfile.js
@@ -96,6 +96,10 @@ function buildRollup(packages) {
               extraPlugins.push(
                 rollupTerser({
                   include: /^.+\.min\.js$/,
+                  // workaround https://bugs.webkit.org/show_bug.cgi?id=212725
+                  output: {
+                    ascii_only: true,
+                  },
                 })
               );
             }