diff --git a/deployment/legacy-migration/maintenance-worker/migration/mongo/.env b/deployment/legacy-migration/maintenance-worker/migration/mongo/.env
index 13c36c143..376cb56d0 100644
--- a/deployment/legacy-migration/maintenance-worker/migration/mongo/.env
+++ b/deployment/legacy-migration/maintenance-worker/migration/mongo/.env
@@ -12,6 +12,6 @@
 # On Windows this resolves to C:\Users\dornhoeschen\AppData\Local\Temp\mongo-export (MinGW)
 EXPORT_PATH='/tmp/mongo-export/'
 EXPORT_MONGOEXPORT_BIN='mongoexport'
-MONGO_EXPORT_SPLIT_SIZE=4000
+MONGO_EXPORT_SPLIT_SIZE=6000
 # On Windows use something like this
 # EXPORT_MONGOEXPORT_BIN='C:\Program Files\MongoDB\Server\3.6\bin\mongoexport.exe'