diff --git a/nixos/modules/virtualisation/parallels-guest.nix b/nixos/modules/virtualisation/parallels-guest.nix
index 490a6beab3f6..5402fe29ee7e 100644
--- a/nixos/modules/virtualisation/parallels-guest.nix
+++ b/nixos/modules/virtualisation/parallels-guest.nix
@@ -47,10 +47,20 @@ in
 
     services.timesyncd.enable = false;
 
+    # Parallels Desktop 26+ mounts shared folders under /mnt/psf by default.
+    # prltoolsd tries to create subdirectories there at runtime, which fails
+    # if /mnt/psf does not exist. Create it declaratively via tmpfiles.
+    systemd.tmpfiles.rules = [
+      "d /mnt/psf 0755 root root - -"
+    ];
+
     systemd.services.prltoolsd = {
       description = "Parallels Tools Service";
       wantedBy = [ "multi-user.target" ];
-      path = [ prl-tools ];
+      # prltoolsd mount scripts invoke coreutils (tail, mkdir, chmod)
+      # and gnused (sed) without inheriting the service PATH in all
+      # code paths. Make them available alongside prl-tools.
+      path = [ prl-tools pkgs.coreutils pkgs.gnused ];
       serviceConfig = {
         ExecStart = "${prl-tools}/bin/prltoolsd -f";
         PIDFile = "/var/run/prltoolsd.pid";