diff --git a/ext_scripts/ext_rbd.py b/ext_scripts/ext_rbd.py
index 7873084cc4aa0a91eadedd333c36988473a162ab..a54f96dae14578aafd5bd11394391e92e3cb6add 100755
--- a/ext_scripts/ext_rbd.py
+++ b/ext_scripts/ext_rbd.py
@@ -350,7 +350,7 @@ def attach(env):
             sys.stderr.write("Image '%s' already mapped to device '%s' \n"
                              % (RBD.format_name(name, pool=pool), device))
 
-    sys.stdout.write("%s" % device.decode())
+    sys.stdout.write("%s" % device)
     qemu_uri = format_qemu_uri(name, pool=pool, cephx=cephx, cache=cache,
                                **userspace_params)
     sys.stdout.write("\n%s" % qemu_uri)