diff --git a/common/dialogs/panel_setup_netclasses.cpp b/common/dialogs/panel_setup_netclasses.cpp
index 7a12c729fb..f9b2cd1670 100644
--- a/common/dialogs/panel_setup_netclasses.cpp
+++ b/common/dialogs/panel_setup_netclasses.cpp
@@ -114,7 +114,6 @@ PANEL_SETUP_NETCLASSES::PANEL_SETUP_NETCLASSES( wxWindow* aParentWindow, EDA_DRA
 
     m_splitter->SetMinimumPaneSize( FromDIP( m_splitter->GetMinimumPaneSize() ) );
 
-    m_originalColWidths = new int[ m_netclassGrid->GetNumberCols() ];
     // Calculate a min best size to handle longest usual numeric values:
     int const min_best_width = m_netclassGrid->GetTextExtent( "555,555555 mils" ).x;
 
@@ -249,8 +248,6 @@ PANEL_SETUP_NETCLASSES::~PANEL_SETUP_NETCLASSES()
     COMMON_SETTINGS* cfg = Pgm().GetCommonSettings();
     cfg->m_NetclassPanel.sash_pos = m_splitter->GetSashPosition();
 
-    delete [] m_originalColWidths;
-
     // Delete the GRID_TRICKS.
     m_netclassGrid->PopEventHandler( true );
     m_assignmentGrid->PopEventHandler( true );
diff --git a/include/dialogs/panel_setup_netclasses.h b/include/dialogs/panel_setup_netclasses.h
index dcc96cca58..36b23c0c28 100644
--- a/include/dialogs/panel_setup_netclasses.h
+++ b/include/dialogs/panel_setup_netclasses.h
@@ -83,7 +83,7 @@ private:
     std::map<wxString, std::shared_ptr<NETCLASS>> m_lastLoaded;
     int                                           m_lastCheckedTicker;
 
-    int*                  m_originalColWidths;
+    std::vector<int>      m_originalColWidths;
     bool                  m_netclassesDirty;    // The netclass drop-down menus need rebuilding
     int                   m_hoveredCol;         // Column being hovered over, for tooltips
     wxString              m_lastPattern;