diff --git a/tools/assistant/lib/qassistantclient.h b/tools/assistant/lib/qassistantclient.h
index a05d291..49d1267 100644
--- a/tools/assistant/lib/qassistantclient.h
+++ b/tools/assistant/lib/qassistantclient.h
@@ -39,7 +39,7 @@
 class QSocket;
 class QProcess;
 
-class QAssistantClient : public QObject
+class Q_EXPORT QAssistantClient : public QObject
 {
     Q_OBJECT
     Q_PROPERTY( bool open READ isOpen )