diff --git a/pcbnew/router/pns_kicad_iface.cpp b/pcbnew/router/pns_kicad_iface.cpp
index 5bde1a01aa..b4a2e9b835 100644
--- a/pcbnew/router/pns_kicad_iface.cpp
+++ b/pcbnew/router/pns_kicad_iface.cpp
@@ -861,7 +861,7 @@ bool PNS_KICAD_IFACE_BASE::ImportSizes( PNS::SIZES_SETTINGS& aSizes, PNS::ITEM*
         holeToHoleMin = constraint.m_Value.Min();
     }
 
-    aSizes.SetDiffPairHoleToHole( holeToHoleMin );
+    aSizes.SetDiffPairHoleToHole( std::max( holeToHoleMin, aSizes.GetHoleToHole() ) );
 
     return true;
 }