diff --git a/library/compiler-builtins/libm/.rustfmt.toml b/library/compiler-builtins/.rustfmt.toml
similarity index 79%
rename from library/compiler-builtins/libm/.rustfmt.toml
rename to library/compiler-builtins/.rustfmt.toml
index c73bb9301e34..79ac399c1b62 100644
--- a/library/compiler-builtins/libm/.rustfmt.toml
+++ b/library/compiler-builtins/.rustfmt.toml
@@ -1,5 +1,4 @@
 # This matches rustc
 style_edition = "2024"
-use_small_heuristics = "Max"
 group_imports = "StdExternalCrate"
 imports_granularity = "Module"