diff --git a/nixos/modules/services/backup/tsm.nix b/nixos/modules/services/backup/tsm.nix
index 8968321f3cee..583334cba298 100644
--- a/nixos/modules/services/backup/tsm.nix
+++ b/nixos/modules/services/backup/tsm.nix
@@ -3,6 +3,7 @@
 let
 
   inherit (lib.attrsets) hasAttr;
+  inherit (lib.meta) getExe';
   inherit (lib.modules) mkDefault mkIf;
   inherit (lib.options) mkEnableOption mkOption;
   inherit (lib.types) nonEmptyStr nullOr;
@@ -94,7 +95,7 @@ in
         # The `-se` option must come after the command.
         # The `-optfile` option suppresses a `dsm.opt`-not-found warning.
         ExecStart =
-          "${cfgPrg.wrappedPackage}/bin/dsmc ${cfg.command} -se='${cfg.servername}' -optfile=/dev/null";
+          "${getExe' cfgPrg.wrappedPackage "dsmc"} ${cfg.command} -se='${cfg.servername}' -optfile=/dev/null";
         LogsDirectory = "tsm-backup";
         StateDirectory = "tsm-backup";
         StateDirectoryMode = "0750";