diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 1de4e25b..8c290ee1 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -227,6 +227,7 @@ Common Lisp:
   primary_extension: .lisp
   extensions:
   - .lisp
+  - .lsp
   - .ny
 
 Coq: