diff --git a/murex.nix b/murex.nix
index b824c41..ea4df3b 100644
--- a/murex.nix
+++ b/murex.nix
@@ -145,7 +145,7 @@
       if echo 17 > /sys/class/gpio/export; then
         echo high > /sys/class/gpio/gpio17/direction
       fi
-      chgrp dialout /sys/class/gpio/gpio17/value
+      chown octoprint:dialout /sys/class/gpio/gpio17/value
     '';
   };
   users.users.${config.services.octoprint.user}.extraGroups = [