diff --git a/acorn.js b/acorn.js
index 3476392618..536605abc5 100644
--- a/acorn.js
+++ b/acorn.js
@@ -2570,8 +2570,9 @@
     case _at:
       var start = storeCurrentPos();
       var node = startNode();
+      var thisNode = startNode();
       next();
-      node.object = { type: "ThisExpression" }
+      node.object = finishNode(thisNode, "ThisExpression");
       node.property = parseSubscripts(parseIdent(), start);
       node.computed = false;
       return finishNode(node, "MemberExpression");
diff --git a/package.json b/package.json
index bded093ed5..9df29bd4da 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "acorn-6to5",
   "description": "Acorn fork used by 6to5",
   "main": "acorn.js",
-  "version": "0.11.1-3",
+  "version": "0.11.1-4",
   "maintainers": [
     {
       "name": "Marijn Haverbeke",