diff --git a/lib/6to5/transformation/helpers/replace-supers.js b/lib/6to5/transformation/helpers/replace-supers.js
index 1b990479d8..fab29d6509 100644
--- a/lib/6to5/transformation/helpers/replace-supers.js
+++ b/lib/6to5/transformation/helpers/replace-supers.js
@@ -259,7 +259,7 @@ ReplaceSupers.prototype.specHandle = function (getThisReference, node, parent) {
     computed = node.computed;
   } else if (t.isAssignmentExpression(node)) {
     if (!t.isIdentifier(node.left.object, { name: "super" })) return;
-    if (methodNode.kind !== 'set') return;
+    if (methodNode.kind !== "set") return;
 
     thisReference = getThisReference();
     // super.name = "val"; -> _set(Object.getPrototypeOf(ClassName.prototype), "name", this);