diff --git a/src/plugins/qbsprojectmanager/qbsnodes.h b/src/plugins/qbsprojectmanager/qbsnodes.h
index a5920972d52..76135f88fb6 100644
--- a/src/plugins/qbsprojectmanager/qbsnodes.h
+++ b/src/plugins/qbsprojectmanager/qbsnodes.h
@@ -68,6 +68,8 @@ private:
 
 class QbsGroupNode;
 
+class QbsGroupNode;
+
 class QbsBaseProjectNode : public ProjectExplorer::ProjectNode
 {
     Q_OBJECT