diff --git a/src/lib/app/browserwindow.cpp b/src/lib/app/browserwindow.cpp
index 4d53df83c..fe1a9400b 100644
--- a/src/lib/app/browserwindow.cpp
+++ b/src/lib/app/browserwindow.cpp
@@ -145,7 +145,7 @@ QDataStream &operator<<(QDataStream &stream, const BrowserWindow::SavedWindow &w
     stream << window.windowGeometry;
     stream << window.virtualDesktop;
     stream << window.currentTab;
-    stream << window.tabs.count();
+    stream << static_cast<int>(window.tabs.count());
 
     for (int i = 0; i < window.tabs.count(); ++i) {
         stream << window.tabs.at(i);
diff --git a/src/lib/session/restoremanager.cpp b/src/lib/session/restoremanager.cpp
index b77f985b8..84397d83f 100644
--- a/src/lib/session/restoremanager.cpp
+++ b/src/lib/session/restoremanager.cpp
@@ -43,7 +43,7 @@ void RestoreData::clear()
 
 QDataStream &operator<<(QDataStream &stream, const RestoreData &data)
 {
-    stream << data.windows.count();
+    stream << static_cast<int>(data.windows.count());
     for (const BrowserWindow::SavedWindow &window : std::as_const(data.windows)) {
         stream << window;
     }