diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index d1288955..5c0a1dba 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -240,6 +240,7 @@ Common Lisp:
   primary_extension: .lisp
   extensions:
   - .lisp
+  - .lsp
   - .ny
 
 Coq: