diff --git a/common/dialogs/panel_setup_netclasses.cpp b/common/dialogs/panel_setup_netclasses.cpp
index f487af2635..704d5ac134 100644
--- a/common/dialogs/panel_setup_netclasses.cpp
+++ b/common/dialogs/panel_setup_netclasses.cpp
@@ -233,7 +233,7 @@ void PANEL_SETUP_NETCLASSES::rebuildNetclassDropdowns()
 
     wxArrayString netclassNames;
 
-    netclassNames.emplace_back( NO_NETCLASS_ASSIGNMENT );
+    netclassNames.emplace_back( wxString( NO_NETCLASS_ASSIGNMENT ) );
 
     for( int ii = 0; ii < m_netclassGrid->GetNumberRows(); ii++ )
     {