diff --git a/Library/Homebrew/cmd/test-bot.rb b/Library/Homebrew/cmd/test-bot.rb
index f2d28a21e5..6ad6cd1f68 100644
--- a/Library/Homebrew/cmd/test-bot.rb
+++ b/Library/Homebrew/cmd/test-bot.rb
@@ -233,7 +233,10 @@ module Homebrew
       end
 
       # Handle Jenkins pull request builder plugin.
-      @url = ENV['ghprbPullLink'] if ENV['ghprbPullLink']
+      if ENV['ghprbPullLink']
+        @url = ENV['ghprbPullLink']
+        @hash = nil
+      end
 
       if no_args?
         if diff_start_sha1 == diff_end_sha1 or \