diff --git a/lib/6to5/traverse/index.js b/lib/6to5/traverse/index.js
index 204969d2a2..22cd2b00ba 100644
--- a/lib/6to5/traverse/index.js
+++ b/lib/6to5/traverse/index.js
@@ -107,6 +107,11 @@ function traverse(parent, opts, scope) {
 
       if (updated) {
         parent[key] = _.flatten(parent[key]);
+
+        if (key === "body") {
+          // we can safely compact this
+          parent[key] = _.compact(parent[key]);
+        }
       }
     } else {
       handle(parent, key);