diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 737f226a..1b093186 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1126,6 +1126,7 @@ Ruby:
   - .gemspec
   - .god
   - .irbrc
+  - .mspec
   - .podspec
   - .rbuild
   - .rbw