diff --git a/debian/patches/pve/0056-migration-block-dirty-bitmap-migrate-other-bitmaps-e.patch b/debian/patches/pve/0056-migration-block-dirty-bitmap-migrate-other-bitmaps-e.patch
new file mode 100644
index 0000000..3154291
--- /dev/null
+++ b/debian/patches/pve/0056-migration-block-dirty-bitmap-migrate-other-bitmaps-e.patch
@@ -0,0 +1,32 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Stefan Reiter <s.reiter@proxmox.com>
+Date: Tue, 3 Nov 2020 14:57:32 +0100
+Subject: [PATCH] migration/block-dirty-bitmap: migrate other bitmaps even if
+ one fails
+
+If the checks in bdrv_dirty_bitmap_check fail, that only means that this
+one specific bitmap cannot be migrated. That is not an error condition
+for any other bitmaps on the same block device.
+
+Fixes dirty-bitmap migration with sync=bitmap, as the bitmaps used for
+that are obviously marked as "busy", which would cause none at all to be
+transferred.
+
+Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
+---
+ migration/block-dirty-bitmap.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
+index 5bf0d9fbc6..1070c19181 100644
+--- a/migration/block-dirty-bitmap.c
++++ b/migration/block-dirty-bitmap.c
+@@ -323,7 +323,7 @@ static int add_bitmaps_to_list(DBMSaveState *s, BlockDriverState *bs,
+ 
+         if (bdrv_dirty_bitmap_check(bitmap, BDRV_BITMAP_DEFAULT, &local_err)) {
+             error_report_err(local_err);
+-            return -1;
++            continue;
+         }
+ 
+         bdrv_ref(bs);
diff --git a/debian/patches/series b/debian/patches/series
index caedae4..0b4ba60 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -56,3 +56,4 @@ pve/0052-PVE-Backup-Use-more-coroutines-and-don-t-block-on-fi.patch
 pve/0053-PVE-fix-and-clean-up-error-handling-for-create_backu.patch
 pve/0054-migration-block-dirty-bitmap-fix-larger-granularity-.patch
 pve/0055-PVE-Migrate-dirty-bitmap-state-via-savevm.patch
+pve/0056-migration-block-dirty-bitmap-migrate-other-bitmaps-e.patch