diff --git a/rustfmt.toml b/rustfmt.toml
index 2a034845c6e..8f4c901fb97 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -7,6 +7,7 @@ merge_derives = false
 # tidy only checks files which are not ignored, each entry follows gitignore style
 ignore = [
     "build",
+    "/vendor/",
 
     # tests for now are not formatted, as they are sometimes pretty-printing constrained
     # (and generally rustfmt can move around comments in UI-testing incompatible ways)