diff --git a/lib/6to5/transformation/transformers/es6/tail-call.js b/lib/6to5/transformation/transformers/es6/tail-call.js
index 5ad846c8cc..6d061bcf11 100644
--- a/lib/6to5/transformation/transformers/es6/tail-call.js
+++ b/lib/6to5/transformation/transformers/es6/tail-call.js
@@ -62,19 +62,16 @@ var functionChildrenVisitor = {
       // transform return argument into statement if
       // it contains tail recursion
       transformExpression(node.argument, scope, state);
-      return;
     } else if (t.isFunction(node)) {
-      return this.skip();
+      // inner function's bodies are irrelevant
+      this.skip();
     } else if (t.isTryStatement(parent)) {
       if (node === parent.block) {
-        return this.skip();
-      } else if (node === parent.finalizer) {
-        return;
-      } else {
-        if (parent.finalizer) {
-          this.skip();
-        }
-        return;
+        // `try`-blocks can't be optimized
+        this.skip();
+      } else if (parent.finalizer && node !== parent.finalizer) {
+        // `catch` clause followed by `finally` can't be optimized
+        this.skip();
       }
     }
   }