diff --git a/packages/external-helpers/lib/external-helpers-dev.js b/packages/external-helpers/lib/external-helpers-dev.js
index 5a9b07ceb2b..24ff678194d 100644
--- a/packages/external-helpers/lib/external-helpers-dev.js
+++ b/packages/external-helpers/lib/external-helpers-dev.js
@@ -60,7 +60,7 @@ function defaults(obj, defaults) {
   return obj;
 }
 
-babelHelpers = {
+var babelHelpers = {
   classCallCheck: classCallCheck,
   inherits: inherits,
   taggedTemplateLiteralLoose: taggedTemplateLiteralLoose,
diff --git a/packages/external-helpers/lib/external-helpers-prod.js b/packages/external-helpers/lib/external-helpers-prod.js
index 4c5aa7fc0a6..d7b29ae6cde 100644
--- a/packages/external-helpers/lib/external-helpers-prod.js
+++ b/packages/external-helpers/lib/external-helpers-prod.js
@@ -50,7 +50,7 @@ function defaults(obj, defaults) {
   return obj;
 }
 
-babelHelpers = {
+var babelHelpers = {
   inherits: inherits,
   taggedTemplateLiteralLoose: taggedTemplateLiteralLoose,
   slice: Array.prototype.slice,