diff --git a/common/block_add_change b/common/block_add_change
index e76235e..3d675aa 100755
--- a/common/block_add_change
+++ b/common/block_add_change
@@ -29,4 +29,4 @@ fi
 xenstore-write "$XS_KEY/desc" "$DESC" "$XS_KEY/size" "$SIZE" "$XS_KEY/mode" "$MODE"
 
 # Make sure that block backend is loaded
-modprobe xen-blkback 2> /dev/null || modprobe blkbk
+/sbin/modprobe xen-blkback 2> /dev/null || /sbin/modprobe blkbk