diff --git a/languages.toml b/languages.toml
index 011ceaf79..4bf39c279 100644
--- a/languages.toml
+++ b/languages.toml
@@ -1022,6 +1022,7 @@ shebangs = []
 comment-token = "#"
 language-servers = [ "nil", "nixd" ]
 indent = { tab-width = 2, unit = "  " }
+formatter = { command = "nixfmt" }
 
 [[grammar]]
 name = "nix"