diff --git a/dom0/qvm-tools/qvm-block b/dom0/qvm-tools/qvm-block
index eea5e4b6..bcdb8eac 100755
--- a/dom0/qvm-tools/qvm-block
+++ b/dom0/qvm-tools/qvm-block
@@ -22,7 +22,7 @@
 
 from qubes.qubes import QubesVmCollection
 from qubes.qubesutils import block_list,block_attach,block_detach,block_check_attached
-from qubes.qubesutils import kbytes_to_kmg
+from qubes.qubesutils import kbytes_to_kmg, bytes_to_kmg
 from optparse import OptionParser
 import subprocess
 import sys