diff --git a/Library/Homebrew/dev-cmd/test-bot.rb b/Library/Homebrew/dev-cmd/test-bot.rb
index d35e763458..d481f2a2d9 100644
--- a/Library/Homebrew/dev-cmd/test-bot.rb
+++ b/Library/Homebrew/dev-cmd/test-bot.rb
@@ -649,7 +649,7 @@ module Homebrew
       @category = __method__
       return if @skip_homebrew
 
-      if @tap.nil?
+      if @tap.nil? && Array(@formulae).empty?
         tests_args = ["--official-cmd-taps"]
         tests_args_no_compat = []
         tests_args_no_compat << "--coverage" if ARGV.include?("--coverage")