diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 6eb2a378..3e101649 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1544,12 +1544,14 @@ Ruby:
   filenames:
   - Appraisals
   - Berksfile
+  - Buildfile
   - Gemfile
   - Gemfile.lock
   - Guardfile
   - Podfile
   - Thorfile
   - Vagrantfile
+  - buildfile
 
 Rust:
   type: programming