diff --git a/NAMESPACE b/NAMESPACE
index 62f5968e..b750e14f 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -7,6 +7,7 @@ export(GMLAbstractGML)
 export(GMLAbstractGeneralDerivedCRS)
 export(GMLAbstractObject)
 export(GMLAbstractSingleCRS)
+export(GMLAbstractSingleOperation)
 export(GMLAbstractTimeGeometricPrimitive)
 export(GMLAbstractTimeObject)
 export(GMLAbstractTimePrimitive)