diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 8a5f9ae8..014c5304 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1629,6 +1629,7 @@ XML:
   filenames:
   - .classpath
   - .project
+  - phpunit.xml.dist
 
 XProc:
   type: programming