diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 076010b4..3e943c2e 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1381,6 +1381,7 @@ Isabelle:
 
 J:
   type: programming
+  color: "#2d8abd"
   extensions:
   - .ijs
   tm_scope: source.j