diff --git a/fstrim.nix b/fstrim.nix
index 0b8d552..119a978 100644
--- a/fstrim.nix
+++ b/fstrim.nix
@@ -8,7 +8,7 @@
       Type = "oneshot";
     };
 
-    script = "fstrim -v /";
+    script = "${pkgs.utillinux.bin}/bin/fstrim -v /";
 
     startAt = "04:00";
   };