diff --git a/simgear/structure/SGSharedPtr.hxx b/simgear/structure/SGSharedPtr.hxx
index fdc64415..d9f5540d 100644
--- a/simgear/structure/SGSharedPtr.hxx
+++ b/simgear/structure/SGSharedPtr.hxx
@@ -134,6 +134,12 @@ private:
   friend class SGWeakPtr;
 };
 
+template<class T>
+void swap(SGSharedPtr<T>& a, SGSharedPtr<T>& b) noexcept
+{
+  a.swap(b);
+}
+
 /**
  * Support for boost::mem_fn
  */