diff --git a/lib/6to5/types.js b/lib/6to5/types.js
index 5102d9125f..c3ccde6d95 100644
--- a/lib/6to5/types.js
+++ b/lib/6to5/types.js
@@ -48,15 +48,27 @@ exports.isReferenced = function (node, parent) {
 };
 
 exports.ensureBlock = function (node) {
-  var block = node.body;
-  if (block.type === "BlockStatement") return;
+  node[key] = exports.toBlock(node.body, node);
+};
 
-  if (!_.isArray(block)) {
-    if (!n.Statement.check(block)) block = b.returnStatement(block);
-    block = [block];
+exports.toBlock = function (node, parent) {
+  if (node.type === "BlockStatement") {
+    return node;
   }
 
-  node.body = b.blockStatement(block);
+  if (!_.isArray(node)) {
+    if (!n.Statement.check(node)) {
+      if (exports.isFunction(parent)) {
+        node = b.returnStatement(node);
+      } else {
+        node = b.expressionStatement(node);
+      }
+    }
+
+    node = [node];
+  }
+
+  return b.blockStatement(node);
 };
 
 exports.getSpecifierName = function (specifier) {