diff --git a/rfc-rustfmt.toml b/rfc-rustfmt.toml
index ec3076c9a3b5..11bfda459563 100644
--- a/rfc-rustfmt.toml
+++ b/rfc-rustfmt.toml
@@ -1,3 +1,4 @@
 fn_args_layout = "Block"
+array_layout = "Block"
 where_style = "Rfc"
 generics_indent = "Tabbed"