diff --git a/wayland_server/display.h b/wayland_server/display.h
index 7298288679..28ac0bcbea 100644
--- a/wayland_server/display.h
+++ b/wayland_server/display.h
@@ -66,7 +66,7 @@ public:
 
     OutputInterface *createOutput(QObject *parent = nullptr);
     void removeOutput(OutputInterface *output);
-    const QList<OutputInterface*> outputs() const {
+    const QList<OutputInterface*> &outputs() const {
         return m_outputs;
     }