diff --git a/Library/Homebrew/cmd/audit.rb b/Library/Homebrew/cmd/audit.rb
index afc279c710..7b7d251697 100644
--- a/Library/Homebrew/cmd/audit.rb
+++ b/Library/Homebrew/cmd/audit.rb
@@ -795,7 +795,7 @@ class FormulaAuditor
       problem "Use the `#{method}` Ruby method instead of `system #{system}`"
     end
 
-    if line =~ /assert .*\.include?/
+    if line =~ /assert [^!]+\.include?/
       problem "Use `assert_match` instead of `assert ...include?`"
     end