diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 6eb2a378..95b94f20 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1858,6 +1858,7 @@ XML:
   - .kml
   - .launch
   - .mxml
+  - .osm
   - .plist
   - .pluginspec
   - .ps1xml