diff --git a/lib/6to5/generation/node/whitespace.js b/lib/6to5/generation/node/whitespace.js
index 3ebb225b76..687e9497e9 100644
--- a/lib/6to5/generation/node/whitespace.js
+++ b/lib/6to5/generation/node/whitespace.js
@@ -28,7 +28,13 @@ exports.before = {
 };
 
 exports.after = {
-  nodes: {},
+  nodes: {
+    AssignmentExpression: function (node) {
+      if (t.isFunction(node.right)) {
+        return 1;
+      }
+    }
+  },
 
   list: {
     VariableDeclaration: function (node) {