diff --git a/Formula/tlsdate.rb b/Formula/tlsdate.rb
index 689b2b6010..300da08c94 100644
--- a/Formula/tlsdate.rb
+++ b/Formula/tlsdate.rb
@@ -17,7 +17,7 @@ class Tlsdate < Formula
     system 'make', 'install'
   end
 
-  def test
-    system 'tlsdate', '--verbose', '--dont-set-clock'
+  test do
+    system "#{bin}/tlsdate", "--verbose", "--dont-set-clock"
   end
 end