--- a/src/fslview/clusterdata.cpp
+++ b/src/fslview/clusterdata.cpp
@@ -33,7 +33,7 @@
 };
 
 BaseCluster::BaseCluster(const ColumnList& cl):
-  m_impl(new Implementation), m_columns(cl)
+  m_columns(cl), m_impl(new Implementation)
 {
   m_headings.insert(std::make_pair("Cluster Index", Index));
   m_headings.insert(std::make_pair("Voxels", Voxels));
