diff --git a/src/modules/bootloader/main.py b/src/modules/bootloader/main.py
index 562895382..88c947cb3 100644
--- a/src/modules/bootloader/main.py
+++ b/src/modules/bootloader/main.py
@@ -134,7 +134,7 @@ def install_bootloader(boot_loader, fw_type):
                 boot_p = boot_device[-1:]
                 device = boot_device[:-1]
                 print(device)
-        subprocess.call(['sgdisk', '--typecode=%s:EF00 %s' % (boot_p, device)])
+        subprocess.call(["sgdisk", "--typecode=%s:EF00" % boot_p, "%s" % device])
         subprocess.call(
             ["gummiboot", "--path=%s/boot" % install_path, "install"])
         create_conf(uuid, conf_path)