diff --git a/Formula/bpytop.rb b/Formula/bpytop.rb
index 5c0b8bface50..0e4097e49461 100644
--- a/Formula/bpytop.rb
+++ b/Formula/bpytop.rb
@@ -48,7 +48,7 @@ def install
 
     log = (config/"error.log").read
     assert_match "bpytop version #{version} started with pid #{pid}", log
-    assert_not_match(/ERROR:/, log)
+    refute_match(/ERROR:/, log)
   ensure
     Process.kill("TERM", pid)
   end