diff --git a/pkgs/by-name/st/stunnel/package.nix b/pkgs/by-name/st/stunnel/package.nix
index 32ee4383ee92..b055cc596fe6 100644
--- a/pkgs/by-name/st/stunnel/package.nix
+++ b/pkgs/by-name/st/stunnel/package.nix
@@ -6,6 +6,8 @@
 , stdenv
 , systemd
 , systemdSupport ? lib.meta.availableOn stdenv.hostPlatform systemd
+, mimalloc
+, mimallocSupport ? false
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -27,6 +29,8 @@ stdenv.mkDerivation (finalAttrs: {
     openssl
   ] ++ lib.optionals systemdSupport [
     systemd
+  ] ++ lib.optionals mimallocSupport [
+    mimalloc
   ];
 
   configureFlags = [