diff --git a/formatter.nix b/formatter.nix
index 6805d6ab1..03d4bb333 100644
--- a/formatter.nix
+++ b/formatter.nix
@@ -43,6 +43,9 @@
           "*.yaml"
           "*.yml"
         ];
+        excludes = [
+          "*/asciinema-player/*"
+        ];
       };
       treefmt.programs.mypy.directories =
         {