diff --git a/acorn.js b/acorn.js
index c981f9b630..e213b8d145 100644
--- a/acorn.js
+++ b/acorn.js
@@ -3365,7 +3365,7 @@
           var listItem = exprList[i];
           if (listItem.type === "TypeCastExpression") {
             var expr = listItem.expression;
-            expr.returnType = listItem.typeAnnotation;
+            expr.typeAnnotation = listItem.typeAnnotation;
             exprList[i] = expr;
           }
         }
diff --git a/package.json b/package.json
index 1473e1dd51..948ea495f7 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "acorn-babel",
   "description": "Acorn fork used by babel",
   "main": "acorn_csp.js",
-  "version": "0.11.1-35",
+  "version": "0.11.1-36",
   "maintainers": [
     {
       "name": "Marijn Haverbeke",