diff --git a/pkgs/servers/klipper/klipper-flash.nix b/pkgs/servers/klipper/klipper-flash.nix
index 95f8a261ebcd..78ba90218953 100644
--- a/pkgs/servers/klipper/klipper-flash.nix
+++ b/pkgs/servers/klipper/klipper-flash.nix
@@ -38,7 +38,7 @@ writeShellApplication {
     if matchBoard != null && matchPlatform != null then
       ''
         pushd ${klipper-firmware}
-        ${klipper}/lib/scripts/flash_usb.py -t ${matchBoard} -d ${flashDevice} ${klipper-firmware}/klipper.bin $@
+        ${klipper}/lib/scripts/flash_usb.py -t ${matchBoard} -d ${flashDevice} ${klipper-firmware}/klipper.bin "$@"
         popd
       ''
     else