diff --git a/tools/assistant/lib/ntqassistantclient.h b/tools/assistant/lib/ntqassistantclient.h
index fc309cf2..c2eefbec 100644
--- a/tools/assistant/lib/ntqassistantclient.h
+++ b/tools/assistant/lib/ntqassistantclient.h
@@ -39,7 +39,7 @@
 class TQSocket;
 class TQProcess;
 
-class TQAssistantClient : public TQObject
+class Q_EXPORT TQAssistantClient : public TQObject
 {
     TQ_OBJECT
     TQ_PROPERTY( bool open READ isOpen )