diff --git a/src/osgEarth/ElevationQuery b/src/osgEarth/ElevationQuery
index d8e4d14..50db567 100644
--- a/src/osgEarth/ElevationQuery
+++ b/src/osgEarth/ElevationQuery
@@ -37,7 +37,11 @@ namespace osgEarth
 
             void pruneUnusedDatabaseCache();
 
+#if OSG_VERSION_GREATER_OR_EQUAL(3,5,0)
+            virtual osg::ref_ptr<osg::Node> readNodeFile(const std::string& filename);
+#else
             virtual osg::Node* readNodeFile(const std::string& filename);
+#endif
 
         protected:
 
diff --git a/src/osgEarth/ElevationQuery.cpp b/src/osgEarth/ElevationQuery.cpp
index 5fb8222..8c03309 100644
--- a/src/osgEarth/ElevationQuery.cpp
+++ b/src/osgEarth/ElevationQuery.cpp
@@ -55,7 +55,11 @@ void ElevationQueryCacheReadCallback::pruneUnusedDatabaseCache()
 {
 }
 
+#if OSG_VERSION_GREATER_OR_EQUAL(3,5,0)
+osg::ref_ptr<osg::Node> ElevationQueryCacheReadCallback::readNodeFile(const std::string& filename)
+#else
 osg::Node* ElevationQueryCacheReadCallback::readNodeFile(const std::string& filename)
+#endif
 {
     // first check to see if file is already loaded.
     {
@@ -71,7 +75,7 @@ osg::Node* ElevationQueryCacheReadCallback::readNodeFile(const std::string& file
     }
 
     // now load the file.
-    osg::ref_ptr<osg::Node> node = osgDB::readNodeFile(filename);
+    osg::ref_ptr<osg::Node> node = osgDB::readRefNodeFile(filename);
 
     // insert into the cache.
     if (node.valid())
@@ -105,7 +109,11 @@ osg::Node* ElevationQueryCacheReadCallback::readNodeFile(const std::string& file
         }
     }
 
+#if OSG_VERSION_GREATER_OR_EQUAL(3,5,0)
+    return node;
+#else
     return node.release();
+#endif
 }
 
 ElevationQuery::ElevationQuery(const Map* map) :
diff --git a/src/osgEarthSymbology/Resource b/src/osgEarthSymbology/Resource
index a8a1441..934fc7d 100644
--- a/src/osgEarthSymbology/Resource
+++ b/src/osgEarthSymbology/Resource
@@ -33,7 +33,7 @@ namespace osgEarth { namespace Symbology
     class OSGEARTHSYMBOLOGY_EXPORT Resource : public Taggable<osg::Object>
     {
     protected:
-        Resource(const Resource& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY) {};
+        Resource(const Resource& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY) : Taggable() {};
         Resource( const Config& config =Config() );
 
         /** dtor */