diff --git a/pcbnew/dialogs/dialog_track_via_size.cpp b/pcbnew/dialogs/dialog_track_via_size.cpp
index 062ecbe6d7..60ef3e7ad4 100644
--- a/pcbnew/dialogs/dialog_track_via_size.cpp
+++ b/pcbnew/dialogs/dialog_track_via_size.cpp
@@ -59,21 +59,21 @@ DIALOG_TRACK_VIA_SIZE::DIALOG_TRACK_VIA_SIZE( wxWindow* aParent, BOARD_DESIGN_SE
 
 bool DIALOG_TRACK_VIA_SIZE::check()
 {
-    if( m_trackWidth.GetValue() < 0 )
+    if( m_trackWidth.GetValue() <= 0 )
     {
         DisplayError( GetParent(), _( "Invalid track width" ) );
         m_trackWidthText->SetFocus();
         return false;
     }
 
-    if( m_viaDiameter.GetValue() < 0 )
+    if( m_viaDiameter.GetValue() <= 0 )
     {
         DisplayError( GetParent(), _( "Invalid via diameter" ) );
         m_viaDiameterText->SetFocus();
         return false;
     }
 
-    if( m_viaDrill.GetValue() < 0 )
+    if( m_viaDrill.GetValue() <= 0 )
     {
         DisplayError( GetParent(), _( "Invalid via drill size" ) );
         m_viaDrillText->SetFocus();