diff --git a/src/plugins/platformthemes/flatpak/qflatpakfiledialog_p.h b/src/plugins/platformthemes/flatpak/qflatpakfiledialog_p.h
index 256f35f7a68..8f65d07e62d 100644
--- a/src/plugins/platformthemes/flatpak/qflatpakfiledialog_p.h
+++ b/src/plugins/platformthemes/flatpak/qflatpakfiledialog_p.h
@@ -51,7 +51,7 @@ class QFlatpakFileDialog : public QPlatformFileDialogHelper
     Q_OBJECT
     Q_DECLARE_PRIVATE(QFlatpakFileDialog)
 public:
-    enum ConditionType {
+    enum ConditionType : uint {
         GlobalPattern = 0,
         MimeType = 1
     };