diff --git a/pcbnew/router/pns_kicad_iface.cpp b/pcbnew/router/pns_kicad_iface.cpp
index 2f44ead9de..7bbb04c041 100644
--- a/pcbnew/router/pns_kicad_iface.cpp
+++ b/pcbnew/router/pns_kicad_iface.cpp
@@ -88,6 +88,8 @@ public:
 
     int ClearanceEpsilon() const { return m_clearanceEpsilon; }
 
+    void ClearCacheForItem( const PNS::ITEM* aItem ) override;
+
 private:
     int holeRadius( const PNS::ITEM* aItem ) const;
 
@@ -294,6 +296,12 @@ bool PNS_PCBNEW_RULE_RESOLVER::QueryConstraint( PNS::CONSTRAINT_TYPE aType,
 }
 
 
+void PNS_PCBNEW_RULE_RESOLVER::ClearCacheForItem( const PNS::ITEM* aItem )
+{
+    m_clearanceCache.erase( std::make_pair( aItem, nullptr ) );
+}
+
+
 int PNS_PCBNEW_RULE_RESOLVER::Clearance( const PNS::ITEM* aA, const PNS::ITEM* aB )
 {
     std::pair<const PNS::ITEM*, const PNS::ITEM*> key( aA, aB );
diff --git a/pcbnew/router/pns_node.h b/pcbnew/router/pns_node.h
index c707b367a1..a8cb643951 100644
--- a/pcbnew/router/pns_node.h
+++ b/pcbnew/router/pns_node.h
@@ -94,6 +94,8 @@ public:
                                   PNS::CONSTRAINT* aConstraint ) = 0;
 
     virtual wxString NetName( int aNet ) = 0;
+
+    virtual void ClearCacheForItem( const ITEM* aItem ) {}
 };
 
 /**
diff --git a/pcbnew/router/pns_router.cpp b/pcbnew/router/pns_router.cpp
index 53d5c03db3..3e1d7fcc43 100644
--- a/pcbnew/router/pns_router.cpp
+++ b/pcbnew/router/pns_router.cpp
@@ -548,6 +548,7 @@ void ROUTER::updateView( NODE* aNode, ITEM_SET& aCurrent, bool aDragging )
 
     for( ITEM* item : added )
     {
+        GetRuleResolver()->ClearCacheForItem( item );
         int clearance = GetRuleResolver()->Clearance( item, nullptr );
         m_iface->DisplayItem( item, clearance, aDragging );
     }