diff --git a/src/core/qgsproject.h b/src/core/qgsproject.h
index f534c14bc24..cba323797d3 100644
--- a/src/core/qgsproject.h
+++ b/src/core/qgsproject.h
@@ -80,6 +80,7 @@ class CORE_EXPORT QgsProject : public QObject, public QgsExpressionContextGenera
     Q_PROPERTY( QgsCoordinateReferenceSystem crs READ crs WRITE setCrs )
     Q_PROPERTY( QgsMapThemeCollection* mapThemeCollection READ mapThemeCollection NOTIFY mapThemeCollectionChanged )
     Q_PROPERTY( QgsSnappingConfig snappingConfig READ snappingConfig WRITE setSnappingConfig NOTIFY snappingConfigChanged )
+    Q_PROPERTY( QgsRelationManager* relationManager READ relationManager )
     Q_PROPERTY( QList<QgsVectorLayer*> avoidIntersectionsLayers READ avoidIntersectionsLayers WRITE setAvoidIntersectionsLayers NOTIFY avoidIntersectionsLayersChanged )
 
   public: