diff --git a/modules/services/monitoring/smartd.nix b/modules/services/monitoring/smartd.nix
index 5a94caefd3b..a4c24c794d6 100644
--- a/modules/services/monitoring/smartd.nix
+++ b/modules/services/monitoring/smartd.nix
@@ -7,7 +7,7 @@ let
   cfg = config.services.smartd;
 
   smartdMail = pkgs.writeScript "smartdmail.sh" ''
-    #! /bin/sh
+    #! ${pkgs.stdenv.shell}
     TMPNAM=/tmp/smartd-message.$$.tmp
     if test -n "$SMARTD_ADDRESS"; then
       echo  >"$TMPNAM" "From: smartd <root>"