From 6e20e7d36440b904b2ce7c1054984c011280f36d Mon Sep 17 00:00:00 2001
From: Ricardo Guilherme Schmidt <3esmit@gmail.com>
Date: Thu, 30 May 2019 22:57:08 -0300
Subject: [PATCH] use .selector

---
 contracts/registry/UsernameRegistrar.sol | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/contracts/registry/UsernameRegistrar.sol b/contracts/registry/UsernameRegistrar.sol
index 05fe2d8..c8e49cf 100644
--- a/contracts/registry/UsernameRegistrar.sol
+++ b/contracts/registry/UsernameRegistrar.sol
@@ -156,8 +156,8 @@ contract UsernameRegistrar is Controlled, ApproveAndCallFallBack {
             //Low level call, case dropUsername not implemented or failing, proceed release.
             //Return of this call have no use.
             newOwner.call.gas(80000)(
-                abi.encodeWithSignature(
-                    "dropUsername(bytes32)",
+                abi.encodeWithSelector(
+                    this.dropUsername.selector,
                     _label
                 )
             );