diff --git a/pkgs/servers/mail/mailman/package.nix b/pkgs/servers/mail/mailman/package.nix
index d008f2389d62..68b38c51aebf 100644
--- a/pkgs/servers/mail/mailman/package.nix
+++ b/pkgs/servers/mail/mailman/package.nix
@@ -60,6 +60,11 @@ buildPythonPackage rec {
       url = "https://gitlab.com/mailman/mailman/-/commit/9613154f3c04fa2383fbf017031ef263c291418d.patch";
       sha256 = "0vyw87s857vfxbf7kihwb6w094xyxmxbi1bpdqi3ybjamjycp55r";
     })
+    (fetchpatch {
+      name = "python-3.13.patch";
+      url = "https://gitlab.com/mailman/mailman/-/commit/685d9a7bdbd382d9e8d4a2da74bd973e93356e05.patch";
+      hash = "sha256-KCXVP+5zqgluUXQCGmMRC+G1hEDnFBlTUETGpmFDOOk=";
+    })
     ./log-stderr.patch
   ];