diff --git a/vstgui/tests/unittest/uidescription/uidescriptionadapter.h b/vstgui/tests/unittest/uidescription/uidescriptionadapter.h
index b5a5ad26e..df28608e9 100644
--- a/vstgui/tests/unittest/uidescription/uidescriptionadapter.h
+++ b/vstgui/tests/unittest/uidescription/uidescriptionadapter.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include "../../../uidescription/iuidescription.h"
+#include "../../../uidescription/uiattributes.h"
 
 namespace VSTGUI {