diff --git a/pkgs/os-specific/linux/util-linux/default.nix b/pkgs/os-specific/linux/util-linux/default.nix
index c66b4cbab830..baaa90e431ba 100644
--- a/pkgs/os-specific/linux/util-linux/default.nix
+++ b/pkgs/os-specific/linux/util-linux/default.nix
@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
     substituteInPlace include/pathnames.h \
       --replace "/bin/login" "${shadow}/bin/login"
     substituteInPlace sys-utils/eject.c \
-      --replace "/bin/umount" "$out/bin/umount"
+      --replace "/bin/umount" "$bin/bin/umount"
   '';
 
   # !!! It would be better to obtain the path to the mount helpers