diff --git a/lib/6to5/transformation/transformers/optional-proto-to-assign.js b/lib/6to5/transformation/transformers/optional-proto-to-assign.js
index 0f18f5a547..5de64efb34 100644
--- a/lib/6to5/transformation/transformers/optional-proto-to-assign.js
+++ b/lib/6to5/transformation/transformers/optional-proto-to-assign.js
@@ -34,7 +34,7 @@ exports.AssignmentExpression = function (node, parent, file, scope) {
   return t.toSequenceExpression(nodes);
 };
 
-exports.ExpressionStatement = function (node, parent, file, scope) {
+exports.ExpressionStatement = function (node, parent, file) {
   var expr = node.expression;
   if (!t.isAssignmentExpression(expr, { operator: "=" })) return;
 
diff --git a/lib/6to5/transformation/transformers/playground-method-binding.js b/lib/6to5/transformation/transformers/playground-method-binding.js
index c14bd6dc3b..6c6bd9e37b 100644
--- a/lib/6to5/transformation/transformers/playground-method-binding.js
+++ b/lib/6to5/transformation/transformers/playground-method-binding.js
@@ -1,5 +1,4 @@
 var t = require("../../types");
-var _ = require("lodash");
 
 exports.BindMemberExpression = function (node, parent, file, scope) {
   var object = node.object;
diff --git a/lib/6to5/types/index.js b/lib/6to5/types/index.js
index a196d4bfed..284fb7eb12 100644
--- a/lib/6to5/types/index.js
+++ b/lib/6to5/types/index.js
@@ -126,10 +126,10 @@ t.toSequenceExpression = function (nodes, scope) {
   });
 
   if (exprs.length === 1) {
-    return exprs[0]
+    return exprs[0];
+  } else {
+    return t.sequenceExpression(exprs);
   }
-
-  return t.sequenceExpression(exprs);
 };
 
 //