diff --git a/src/gui/macOS/fileproviderservice.h b/src/gui/macOS/fileproviderservice.h
index 583f197adefcf..98fe8ba9334ff 100644
--- a/src/gui/macOS/fileproviderservice.h
+++ b/src/gui/macOS/fileproviderservice.h
@@ -7,6 +7,7 @@
 
 #include <QHash>
 #include <QObject>
+#include <QReadWriteLock>
 
 #include "libsync/account.h"
 #include "libsync/syncresult.h"
@@ -62,6 +63,7 @@ class FileProviderService : public QObject
     class MacImplementation;
     std::unique_ptr<MacImplementation> d;
 
+    mutable QReadWriteLock _syncStatusLock;
     QHash<QString, SyncResult::Status> _latestReceivedSyncStatus;
 };
 
diff --git a/src/gui/macOS/fileproviderservice.mm b/src/gui/macOS/fileproviderservice.mm
index daeaabd69f6c3..c3643d36d9c1f 100644
--- a/src/gui/macOS/fileproviderservice.mm
+++ b/src/gui/macOS/fileproviderservice.mm
@@ -9,6 +9,8 @@
 #import "AppProtocol.h"
 
 #include <QLoggingCategory>
+#include <QReadLocker>
+#include <QWriteLocker>
 
 #include "accountmanager.h"
 
@@ -119,11 +121,13 @@ - (void)reportSyncStatus:(NSString *)status forDomainIdentifier:(NSString *)doma
 SyncResult::Status FileProviderService::latestReceivedSyncStatusForAccount(const AccountPtr &account) const
 {
     Q_ASSERT(account);
+    QReadLocker locker(&_syncStatusLock);
     return _latestReceivedSyncStatus.value(account->userIdAtHostWithPort(), SyncResult::Undefined);
 }
 
 void FileProviderService::setLatestReceivedSyncStatus(const QString &userId, SyncResult::Status status)
 {
+    QWriteLocker locker(&_syncStatusLock);
     _latestReceivedSyncStatus.insert(userId, status);
 }