diff --git a/tests/auto/wayland/shared/corecompositor.cpp b/tests/auto/wayland/shared/corecompositor.cpp
index 7edb1c2d434..5c6c83baa88 100644
--- a/tests/auto/wayland/shared/corecompositor.cpp
+++ b/tests/auto/wayland/shared/corecompositor.cpp
@@ -43,6 +43,7 @@ CoreCompositor::CoreCompositor()
         }
     })
 {
+    qputenv("WAYLAND_DISPLAY", m_socketName);
     m_timer.start();
     Q_ASSERT(isClean());
 }