diff --git a/kiauh/extensions/gcode_shell_cmd/assets/gcode_shell_command.py b/kiauh/extensions/gcode_shell_cmd/assets/gcode_shell_command.py
index 85b664b..0b2203e 100644
--- a/kiauh/extensions/gcode_shell_cmd/assets/gcode_shell_command.py
+++ b/kiauh/extensions/gcode_shell_cmd/assets/gcode_shell_command.py
@@ -16,6 +16,7 @@ class ShellCommand:
         self.gcode = self.printer.lookup_object("gcode")
         cmd = config.get("command")
         cmd = os.path.expanduser(cmd)
+        cmd = os.path.expandvars(cmd)
         self.command = shlex.split(cmd)
         self.timeout = config.getfloat("timeout", 2.0, above=0.0)
         self.verbose = config.getboolean("verbose", True)