diff --git a/src/osgGA/OrbitManipulator.cpp b/src/osgGA/OrbitManipulator.cpp
index 4ac666e83..3afb44ac7 100644
--- a/src/osgGA/OrbitManipulator.cpp
+++ b/src/osgGA/OrbitManipulator.cpp
@@ -450,9 +450,9 @@ void OrbitManipulator::zoomModel( const float dy, bool pushForwardIfNeeded )
         if( pushForwardIfNeeded )
         {
             // push the camera forward
-            float scale = -_distance;
+            float yscale = -_distance;
             Matrixd rotation_matrix( _rotation );
-            Vec3d dv = (Vec3d( 0.0f, 0.0f, -1.0f ) * rotation_matrix) * (dy * scale);
+            Vec3d dv = (Vec3d( 0.0f, 0.0f, -1.0f ) * rotation_matrix) * (dy * yscale);
             _center += dv;
         }
         else