diff --git a/pcbnew/dialogs/dialog_export_step.cpp b/pcbnew/dialogs/dialog_export_step.cpp
index f1bf73c447..7b86f99fe1 100644
--- a/pcbnew/dialogs/dialog_export_step.cpp
+++ b/pcbnew/dialogs/dialog_export_step.cpp
@@ -101,6 +101,7 @@ DIALOG_EXPORT_STEP::DIALOG_EXPORT_STEP( PCB_EDIT_FRAME* aEditFrame, wxWindow* aP
         DIALOG_EXPORT_STEP_BASE( aEditFrame ),
         m_editFrame( aEditFrame ),
         m_job( aJob ),
+        m_originUnits( 0 /* mm */ ),
         m_boardPath( aBoardPath )
 {
     if( !m_job )