diff --git a/src/osgPlugins/pfb/ConvertToPerformer.cpp b/src/osgPlugins/pfb/ConvertToPerformer.cpp
index b47d4274c..c9bc8ab38 100644
--- a/src/osgPlugins/pfb/ConvertToPerformer.cpp
+++ b/src/osgPlugins/pfb/ConvertToPerformer.cpp
@@ -10,11 +10,10 @@
 #include <osg/Image>
 #include <osg/Notify>
 
-#include <osgDB/Registry>
+//#include <osgDB/Registry>
 #include <osgDB/FileNameUtils>
 #include <osgDB/ReadFile>
 
-
 #include <Performer/pf/pfNode.h>
 #include <Performer/pf/pfGeode.h>
 #include <Performer/pf/pfBillboard.h>
@@ -160,12 +159,12 @@ void ConvertToPerformer::apply(osg::Transform& osgTransform)
 
     if (!osgTransform.getName().empty()) pf_dcs->setName(osgTransform.getName().c_str());
 
-    osg::Matrix& matrix = osgTransform.getMatrix();
+    const osg::Matrix& matrix = osgTransform.getMatrix();
 
-    pfMatrix pf_matrix(matrix[0][0],matrix[0][1],matrix[0][2],matrix[0][3],
-        matrix[1][0],matrix[1][1],matrix[1][2],matrix[1][3],
-        matrix[2][0],matrix[2][1],matrix[2][2],matrix[2][3],
-        matrix[3][0],matrix[3][1],matrix[3][2],matrix[3][3]);
+    pfMatrix pf_matrix(matrix(0,0),matrix(0,1),matrix(0,2),matrix(0,3),
+        matrix(1,0),matrix(1,1),matrix(1,2),matrix(1,3),
+        matrix(2,0),matrix(2,1),matrix(2,2),matrix(2,3),
+        matrix(3,0),matrix(3,1),matrix(3,2),matrix(3,3));
 
     pf_dcs->setMat(pf_matrix);