diff --git a/compiler/rustc_codegen_gcc/.rustfmt.toml b/compiler/rustc_codegen_gcc/.rustfmt.toml
index 2a35f0230c6..725aec25a07 100644
--- a/compiler/rustc_codegen_gcc/.rustfmt.toml
+++ b/compiler/rustc_codegen_gcc/.rustfmt.toml
@@ -1 +1,3 @@
+version = "Two"
 use_small_heuristics = "Max"
+merge_derives = false