diff --git a/examples/lxcconvert/virt-lxc-convert b/examples/lxcconvert/virt-lxc-convert
index 722015310fddc445097bc7bd817590094fb3a21e..e62172eea4f6d12e272df7512999b3eb6075bca4 100644
--- a/examples/lxcconvert/virt-lxc-convert
+++ b/examples/lxcconvert/virt-lxc-convert
@@ -64,7 +64,7 @@ if test -r "$fstab"; then
     sed 's/^\([^#]\)/lxc.mount.entry = \1/' "$fstab" >>"${conf_new}"
 fi
 
-memory=$(free | sed -n '/Mem:/s/ \+/ /gp' | cut -f 2 -d ' ')
+memory=$(free -b | sed -n '/Mem:/s/ \+/ /gp' | cut -f 2 -d ' ')
 default_tmpfs="size=$((memory/2))"
 
 # Do we have tmpfs without size param?