diff --git a/VolZmap.cpp b/VolZmap.cpp
index 4f105f2..5b68000 100644
--- a/VolZmap.cpp
+++ b/VolZmap.cpp
@@ -133,6 +133,7 @@ VolZmap::CopyFrom( const VolZmap& vzmSrc)
    m_nFracLin[0] = vzmSrc.m_nFracLin[0] ;
    m_nFracLin[1] = vzmSrc.m_nFracLin[1] ;
    m_nFracLin[2] = vzmSrc.m_nFracLin[2] ;
+   m_nDexVoxRatio = vzmSrc.m_nDexVoxRatio ;
    m_nConnectedCompoCount = vzmSrc.m_nConnectedCompoCount ;
    
    m_MapFrame = vzmSrc.m_MapFrame ;