diff --git a/nixos/modules/security/setuid-wrappers.nix b/nixos/modules/security/setuid-wrappers.nix
index dcccd834286..fe220c94313 100644
--- a/nixos/modules/security/setuid-wrappers.nix
+++ b/nixos/modules/security/setuid-wrappers.nix
@@ -132,7 +132,7 @@ in
             # Compatibility with old state, just remove the folder and symlink
             rm -f ${wrapperDir}/*
             # if it happens to be a tmpfs
-            umount ${wrapperDir} || true
+            ${pkgs.utillinux}/bin/umount ${wrapperDir} || true
             rm -d ${wrapperDir}
             ln -d --symbolic $wrapperDir ${wrapperDir}
           else