diff --git a/debian/changelog b/debian/changelog
index a8803db5..20af71b4 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -5,6 +5,9 @@ livecd-rootfs (2.442) UNRELEASED; urgency=medium
     comparison prior to aa-series (LP: #1681548)
   * live-build/ubuntu-cpc/hooks/999-extras.binary: Exit on first failure
 
+  [Balint Reczey]
+  * sync before calling kpartx to let writing to loop devices finish
+
  -- Steve Langasek <steve.langasek@ubuntu.com>  Thu, 13 Apr 2017 10:38:04 -0700
 
 livecd-rootfs (2.441) zesty; urgency=medium
diff --git a/live-build/functions b/live-build/functions
index 5abdeea1..313a559b 100644
--- a/live-build/functions
+++ b/live-build/functions
@@ -13,6 +13,8 @@ apt-get -qqy install dosfstools gdisk
 clean_loops() {
 
     if [ -n "${backing_img}" ]; then
+        # sync before removing loop to avoid "Device or resource busy" errors
+        sync
         kpartx -v -d "${backing_img}"
         unset backing_img
     fi