diff --git a/languages.toml b/languages.toml
index e1ee2eb09..072e25304 100644
--- a/languages.toml
+++ b/languages.toml
@@ -2726,6 +2726,7 @@ file-types = ["kdl"]
 comment-token = "//"
 block-comment-tokens = { start = "/*", end = "*/" }
 injection-regex = "kdl"
+formatter = { command = "kdlfmt", args = ["format", "-"] }
 
 [[grammar]]
 name = "kdl"