diff --git a/src/libsync/propagatedownload.cpp b/src/libsync/propagatedownload.cpp
index b8aa15e0f8..6356e24da3 100644
--- a/src/libsync/propagatedownload.cpp
+++ b/src/libsync/propagatedownload.cpp
@@ -881,6 +881,7 @@ void PropagateDownloadFile::contentChecksumComputed(const QByteArray &checksumTy
 
 void PropagateDownloadFile::downloadFinished()
 {
+    ASSERT(!_tmpFile.isOpen());
     QString fn = propagator()->getFilePath(_item->_file);
 
     // In case of file name clash, report an error
diff --git a/src/libsync/propagatedownloadzsync.cpp b/src/libsync/propagatedownloadzsync.cpp
index 1bece1bae4..ae80b53c5c 100644
--- a/src/libsync/propagatedownloadzsync.cpp
+++ b/src/libsync/propagatedownloadzsync.cpp
@@ -129,6 +129,8 @@ bool GETFileZsyncJob::finished()
     }
 
     if (!_hasEmittedFinishedSignal) {
+        _zr.reset();
+        _zs.reset(); // ensure the file is closed.
         emit finishedSignal();
     }
 
@@ -179,6 +181,8 @@ void GETFileZsyncJob::seedFinished(void *zs)
     if (_nrange == 0 && _item->_size == quint64(zsync_file_length(_zs.get()))) {
         _propagator->reportFileTotal(*_item, 0);
         _errorStatus = SyncFileItem::Success;
+        _zr.reset();
+        _zs.reset(); // ensure the file is closed.
         emit finishedSignal();
         return;
     }