diff --git a/src/KGantt/kganttgraphicsitem.h b/src/KGantt/kganttgraphicsitem.h
--- a/src/KGantt/kganttgraphicsitem.h
+++ b/src/KGantt/kganttgraphicsitem.h
@@ -31,7 +31,7 @@
 class QGraphicsLineItem;
 QT_END_NAMESPACE
 
-namespace KGANTT_EXPORT KGantt {
+namespace KGantt {
     class GraphicsScene;
     class ConstraintGraphicsItem;