diff --git a/src/corelib/thread/qfutureinterface_p.h b/src/corelib/thread/qfutureinterface_p.h
index 0c01a0f97d..24902cbc9a 100644
--- a/src/corelib/thread/qfutureinterface_p.h
+++ b/src/corelib/thread/qfutureinterface_p.h
@@ -122,7 +122,7 @@ private:
     { }
 };
 
-class QFutureCallOutInterface
+class Q_CORE_EXPORT QFutureCallOutInterface
 {
 public:
     virtual ~QFutureCallOutInterface();