diff --git a/formatter.nix b/formatter.nix
index 69571e244..235ee76af 100644
--- a/formatter.nix
+++ b/formatter.nix
@@ -37,6 +37,7 @@
         "vars/*"
         # prettier messes up our mkdocs flavoured markdown
         "*.md"
+        "**/node_modules/*"
 
         "checks/data-mesher/vars/*"
         "checks/lib/ssh/privkey"