diff --git a/library/compiler-builtins/libm/.git-blame-ignore-revs b/library/compiler-builtins/.git-blame-ignore-revs
similarity index 58%
rename from library/compiler-builtins/libm/.git-blame-ignore-revs
rename to library/compiler-builtins/.git-blame-ignore-revs
index c1e43134f36f..2ede10da53d7 100644
--- a/library/compiler-builtins/libm/.git-blame-ignore-revs
+++ b/library/compiler-builtins/.git-blame-ignore-revs
@@ -2,4 +2,5 @@
 # `git blame` ignore the following commits.
 
 # Reformat with a new `.rustfmt.toml`
-5882cabb83c30bf7c36023f9a55a80583636b0e8
+# In rust-lang/libm this was 5882cabb83c30bf7c36023f9a55a80583636b0e8
+4bb07a6275cc628ef81c65ac971dc6479963322f