diff --git a/simgear/scene/model/shadowvolume.hxx b/simgear/scene/model/shadowvolume.hxx
index 11fc71fd..bd941ce5 100644
--- a/simgear/scene/model/shadowvolume.hxx
+++ b/simgear/scene/model/shadowvolume.hxx
@@ -130,7 +130,7 @@ private:
 	bool	shadowsAC_transp_enabled;
 	bool	use_alpha;
 	bool	canDoAlpha, canDoStencil;
-	SGPropertyNode *sim_rendering;
+	SGPropertyNode_ptr sim_rendering;
 
 	sgVec3 sunPos;
 	int frameNumber;
diff --git a/simgear/structure/event_mgr.hxx b/simgear/structure/event_mgr.hxx
index 746f03c0..007321b8 100644
--- a/simgear/structure/event_mgr.hxx
+++ b/simgear/structure/event_mgr.hxx
@@ -117,8 +117,8 @@ private:
              double interval, double delay,
              bool repeat, bool simtime);
 
-    SGPropertyNode* _freezeProp;
-    SGPropertyNode* _rtProp;
+    SGPropertyNode_ptr _freezeProp;
+    SGPropertyNode_ptr _rtProp;
     SGTimerQueue _rtQueue; 
     SGTimerQueue _simQueue;
 };