diff --git a/appveyor.yml b/appveyor.yml
index 9a7f981..8b1af9b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -31,7 +31,7 @@ build:
 test_script:
   - nuget.exe install OpenCover -ExcludeVersion
   - nuget.exe install NUnit.Runners -ExcludeVersion
-  - OpenCover\tools\OpenCover.Console.exe -register:user -filter:"+[*]*" -target:"NUnit.Console\tools\nunit3-console.exe" "-targetargs:/domain:single HtmlSanitizer.Tests\bin\release\HtmlSanitizer.Tests.dll" -returntargetcode -hideskipped:All -output:coverage.xml
+  - OpenCover\tools\OpenCover.Console.exe -register:user -filter:"+[HtmlSanitizer]*" -target:"NUnit.Console\tools\nunit3-console.exe" "-targetargs:/domain:single HtmlSanitizer.Tests\bin\release\HtmlSanitizer.Tests.dll" -returntargetcode -hideskipped:All -output:coverage.xml
   - "SET PATH=C:\\Python34;C:\\Python34\\Scripts;%PATH%"
   - pip install codecov
   - codecov -f "coverage.xml"