1 files changed, 1 insertions, 0 deletions
diff --git a/rustfmt.toml b/rustfmt.toml
index d9857a7e3e7..689e390b990 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -29,6 +29,7 @@ ignore = [
 
     # Do not format submodules.
     "library/backtrace",
+    "library/compiler-builtins",
     "library/portable-simd",
     "library/stdarch",
     "src/doc/book",