diff --git a/Library/Homebrew/test/cmd/upgrade_spec.rb b/Library/Homebrew/test/cmd/upgrade_spec.rb
index 1fc6f65c4d..436b513cb7 100644
--- a/Library/Homebrew/test/cmd/upgrade_spec.rb
+++ b/Library/Homebrew/test/cmd/upgrade_spec.rb
@@ -54,8 +54,7 @@ RSpec.describe Homebrew::Cmd::UpgradeCmd do
 
     expect do
       brew "upgrade", "--ask"
-    end.to output(/.*Formulae\s*\(3\):\s*(?:testball|testball5|testball4)\s*,?\s*(?:testball|testball5|testball4)\s*,?
-\s*(?:testball|testball5|testball4).*/)
+    end.to output(/Formulae\s*\(3\):\s*(testball|testball5|testball4)\s*,\s*(?!(\1))(testball|testball5|testball4)\s*,\s*(?!(\1|\3))(testball|testball5|testball4)/)
       .to_stdout.and not_to_output.to_stderr
 
     expect(HOMEBREW_CELLAR/"testball/0.1").to be_a_directory