diff --git a/src/osgPlugins/txp/TerrapageNode.cpp b/src/osgPlugins/txp/TerrapageNode.cpp
index c8fbb1181..b5b2bd012 100644
--- a/src/osgPlugins/txp/TerrapageNode.cpp
+++ b/src/osgPlugins/txp/TerrapageNode.cpp
@@ -2,6 +2,8 @@
 
 #include <osg/Notify>
 
+using namespace osg;
+
 namespace txp
 {
 
diff --git a/src/osgSim/BlinkSequence.cpp b/src/osgSim/BlinkSequence.cpp
index 1d167eaec..2ffe6fa74 100644
--- a/src/osgSim/BlinkSequence.cpp
+++ b/src/osgSim/BlinkSequence.cpp
@@ -21,7 +21,7 @@ BlinkSequence::BlinkSequence():
 }
 
 BlinkSequence::BlinkSequence(const BlinkSequence& bs):
-    Referenced(),
+    osg::Referenced(),
     _pulsePeriod(bs._pulsePeriod),
     _phaseShift(bs._phaseShift),
     _pulseData(bs._pulseData),