diff --git a/test/test_grammars.rb b/test/test_grammars.rb
index f010b79b..188bc187 100644
--- a/test/test_grammars.rb
+++ b/test/test_grammars.rb
@@ -60,7 +60,7 @@ class TestGrammars < Minitest::Test
   def test_submodules_have_licenses
     categories = submodule_paths.group_by do |submodule|
       files = Dir[File.join(ROOT, submodule, "*")]
-      license = files.find { |path| File.basename(path) =~ /\blicen[cs]e\b/i } || files.find { |path| File.basename(path) =~ /\bcopying\b/i }
+      license = files.find { |path| File.basename(path) =~ /\b(un)?licen[cs]e\b/i } || files.find { |path| File.basename(path) =~ /\bcopying\b/i }
       if license.nil?
         if readme = files.find { |path| File.basename(path) =~ /\Areadme\b/i }
           license = readme if File.read(readme) =~ /\blicen[cs]e\b/i