diff --git a/src/libsync/propagateupload.cpp b/src/libsync/propagateupload.cpp
index a8b260515c..d50658e022 100644
--- a/src/libsync/propagateupload.cpp
+++ b/src/libsync/propagateupload.cpp
@@ -573,11 +573,11 @@ void PropagateUploadFileCommon::abortWithError(SyncFileItem::Status status, cons
 QMap<QByteArray, QByteArray> PropagateUploadFileCommon::headers()
 {
     QMap<QByteArray, QByteArray> headers;
-    headers["OC-Async"] = "1";
-    headers["Content-Type"] = "application/octet-stream";
-    headers["X-OC-Mtime"] = QByteArray::number(qint64(_item->_modtime));
+    headers[QByteArrayLiteral("OC-Async")] = QByteArrayLiteral("1");
+    headers[QByteArrayLiteral("Content-Type")] = QByteArrayLiteral("application/octet-stream");
+    headers[QByteArrayLiteral("X-OC-Mtime")] = QByteArray::number(qint64(_item->_modtime));
 
-    if (_item->_file.contains(".sys.admin#recall#")) {
+    if (_item->_file.contains(QLatin1String(".sys.admin#recall#"))) {
         // This is a file recall triggered by the admin.  Note: the
         // recall list file created by the admin and downloaded by the
         // client (.sys.admin#recall#) also falls into this category
@@ -594,21 +594,21 @@ QMap<QByteArray, QByteArray> PropagateUploadFileCommon::headers()
         && !_deleteExisting) {
         // We add quotes because the owncloud server always adds quotes around the etag, and
         //  csync_owncloud.c's owncloud_file_id always strips the quotes.
-        headers["If-Match"] = '"' + _item->_etag + '"';
+        headers[QByteArrayLiteral("If-Match")] = '"' + _item->_etag + '"';
     }
 
     // Set up a conflict file header pointing to the original file
     auto conflictRecord = propagator()->_journal->conflictRecord(_item->_file.toUtf8());
     if (conflictRecord.isValid()) {
-        headers["OC-Conflict"] = "1";
+        headers[QByteArrayLiteral("OC-Conflict")] = "1";
         if (!conflictRecord.initialBasePath.isEmpty())
-            headers["OC-ConflictInitialBasePath"] = conflictRecord.initialBasePath;
+            headers[QByteArrayLiteral("OC-ConflictInitialBasePath")] = conflictRecord.initialBasePath;
         if (!conflictRecord.baseFileId.isEmpty())
-            headers["OC-ConflictBaseFileId"] = conflictRecord.baseFileId;
+            headers[QByteArrayLiteral("OC-ConflictBaseFileId")] = conflictRecord.baseFileId;
         if (conflictRecord.baseModtime != -1)
-            headers["OC-ConflictBaseMtime"] = QByteArray::number(conflictRecord.baseModtime);
+            headers[QByteArrayLiteral("OC-ConflictBaseMtime")] = QByteArray::number(conflictRecord.baseModtime);
         if (!conflictRecord.baseEtag.isEmpty())
-            headers["OC-ConflictBaseEtag"] = conflictRecord.baseEtag;
+            headers[QByteArrayLiteral("OC-ConflictBaseEtag")] = conflictRecord.baseEtag;
     }
 
     return headers;
diff --git a/src/libsync/propagateuploadng.cpp b/src/libsync/propagateuploadng.cpp
index e141bcc867..b7b1afb6c6 100644
--- a/src/libsync/propagateuploadng.cpp
+++ b/src/libsync/propagateuploadng.cpp
@@ -504,17 +504,17 @@ void PropagateUploadFileNG::doFinalMove()
     auto headers = PropagateUploadFileCommon::headers();
 
     // "If-Match applies to the source, but we are interested in comparing the etag of the destination
-    auto ifMatch = headers.take("If-Match");
+    auto ifMatch = headers.take(QByteArrayLiteral("If-Match"));
     if (!ifMatch.isEmpty()) {
-        headers["If"] = "<" + destination.toUtf8() + "> ([" + ifMatch + "])";
+        headers[QByteArrayLiteral("If")] = "<" + destination.toUtf8() + "> ([" + ifMatch + "])";
     }
     if (!_transmissionChecksumHeader.isEmpty()) {
         headers[checkSumHeaderC] = _transmissionChecksumHeader;
     }
-    headers["OC-Total-Length"] = QByteArray::number(_bytesToUpload);
-    headers["OC-Total-File-Length"] = QByteArray::number(_item->_size);
+    headers[QByteArrayLiteral("OC-Total-Length")] = QByteArray::number(_bytesToUpload);
+    headers[QByteArrayLiteral("OC-Total-File-Length")] = QByteArray::number(_item->_size);
 
-    QUrl source = _zsyncSupported ? Utility::concatUrlPath(chunkUrl(), "/.file.zsync") : Utility::concatUrlPath(chunkUrl(), "/.file");
+    QUrl source = _zsyncSupported ? Utility::concatUrlPath(chunkUrl(), QStringLiteral("/.file.zsync")) : Utility::concatUrlPath(chunkUrl(), QStringLiteral("/.file"));
 
     auto job = new MoveJob(propagator()->account(), source, destination, headers, this);
     _jobs.append(job);
diff --git a/src/libsync/propagateuploadv1.cpp b/src/libsync/propagateuploadv1.cpp
index c24e7b648c..3b37c37dc9 100644
--- a/src/libsync/propagateuploadv1.cpp
+++ b/src/libsync/propagateuploadv1.cpp
@@ -86,8 +86,8 @@ void PropagateUploadFileV1::startNextChunk()
     }
     quint64 fileSize = _item->_size;
     auto headers = PropagateUploadFileCommon::headers();
-    headers["OC-Total-Length"] = QByteArray::number(fileSize);
-    headers["OC-Chunk-Size"] = QByteArray::number(quint64(chunkSize()));
+    headers[QByteArrayLiteral("OC-Total-Length")] = QByteArray::number(fileSize);
+    headers[QByteArrayLiteral("OC-Chunk-Size")] = QByteArray::number(quint64(chunkSize()));
 
     QString path = _item->_file;
 
@@ -102,7 +102,7 @@ void PropagateUploadFileV1::startNextChunk()
         qCInfo(lcPropagateUpload) << "Upload chunk" << sendingChunk << "of" << _chunkCount << "transferid(remote)=" << transid;
         path += QString("-chunking-%1-%2-%3").arg(transid).arg(_chunkCount).arg(sendingChunk);
 
-        headers["OC-Chunked"] = "1";
+        headers[QByteArrayLiteral("OC-Chunked")] = QByteArrayLiteral("1");
 
         chunkStart = chunkSize() * quint64(sendingChunk);
         currentChunkSize = chunkSize();