diff --git a/.prettierignore b/.prettierignore
index c16a3a92c9..03366aa692 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -11,3 +11,4 @@ test/snapshots-no-hmr
 test/js/deno/*.test.ts
 test/js/deno/**/*.test.ts
 bench/react-hello-world/react-hello-world.node.js
+test/cli/run/encoding-utf16-le-bom.ts