diff --git a/webcomponents/highlight-code/CHANGELOG.md b/webcomponents/highlight-code/CHANGELOG.md
index 6a49a7d59..c4ed078f1 100644
--- a/webcomponents/highlight-code/CHANGELOG.md
+++ b/webcomponents/highlight-code/CHANGELOG.md
@@ -8,6 +8,7 @@
 
 - support alias (such as `html` for `markup`)
 - load alias required scripts
+- required scripts loading race condition
 
 # 2.2.1 (2020-11-19)
 
diff --git a/webcomponents/highlight-code/src/components/highlight-code/deckdeckgo-highlight-code.tsx b/webcomponents/highlight-code/src/components/highlight-code/deckdeckgo-highlight-code.tsx
index 1c85cef80..bcfd8c7c0 100644
--- a/webcomponents/highlight-code/src/components/highlight-code/deckdeckgo-highlight-code.tsx
+++ b/webcomponents/highlight-code/src/components/highlight-code/deckdeckgo-highlight-code.tsx
@@ -227,7 +227,7 @@ export class DeckdeckgoHighlightCode {
 
       document.head.appendChild(script);
 
-      resolve();
+      script.addEventListener('load', () => resolve(), {once: true});
     });
   }