diff --git a/src/osgGA/CameraManipulator.cpp b/src/osgGA/CameraManipulator.cpp
index c73bfeb16..c957f880b 100644
--- a/src/osgGA/CameraManipulator.cpp
+++ b/src/osgGA/CameraManipulator.cpp
@@ -21,8 +21,7 @@ CameraManipulator::CameraManipulator()
 
 
 CameraManipulator::CameraManipulator(const CameraManipulator& mm, const CopyOp& copyOp)
-   : osg::Callback(mm, copyOp),
-     inherited(mm, copyOp),
+   : inherited(mm, copyOp),
      _intersectTraversalMask(mm._intersectTraversalMask),
      _autoComputeHomePosition(mm._autoComputeHomePosition),
      _homeEye(mm._homeEye),
diff --git a/src/osgGA/StandardManipulator.cpp b/src/osgGA/StandardManipulator.cpp
index d0c73c71e..bdb8a5f7c 100644
--- a/src/osgGA/StandardManipulator.cpp
+++ b/src/osgGA/StandardManipulator.cpp
@@ -48,18 +48,17 @@ StandardManipulator::StandardManipulator( int flags )
 
 /// Constructor.
 StandardManipulator::StandardManipulator( const StandardManipulator& uim, const CopyOp& copyOp )
-    : osg::Callback(uim, copyOp),
-     inherited( uim, copyOp ),
-     _thrown( uim._thrown ),
-     _allowThrow( uim._allowThrow ),
-     _mouseCenterX(0.0f), _mouseCenterY(0.0f),
-     _ga_t1( dynamic_cast< GUIEventAdapter* >( copyOp( uim._ga_t1.get() ) ) ),
-     _ga_t0( dynamic_cast< GUIEventAdapter* >( copyOp( uim._ga_t0.get() ) ) ),
-     _delta_frame_time(0.01), _last_frame_time(0.0),
-     _modelSize( uim._modelSize ),
-     _verticalAxisFixed( uim._verticalAxisFixed ),
-     _flags( uim._flags ),
-     _relativeFlags( uim._relativeFlags )
+    : inherited( uim, copyOp ),
+      _thrown( uim._thrown ),
+      _allowThrow( uim._allowThrow ),
+      _mouseCenterX(0.0f), _mouseCenterY(0.0f),
+      _ga_t1( dynamic_cast< GUIEventAdapter* >( copyOp( uim._ga_t1.get() ) ) ),
+      _ga_t0( dynamic_cast< GUIEventAdapter* >( copyOp( uim._ga_t0.get() ) ) ),
+      _delta_frame_time(0.01), _last_frame_time(0.0),
+      _modelSize( uim._modelSize ),
+      _verticalAxisFixed( uim._verticalAxisFixed ),
+      _flags( uim._flags ),
+      _relativeFlags( uim._relativeFlags )
 {
 }