diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 3d2b02b5..fe5e30cd 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -804,7 +804,7 @@ Grace:
   type: programming
   lexer: Text only
   extensions:
-    - .grace
+  - .grace
 
 Grammatical Framework:
   type: programming