diff --git a/pcbnew/router/pns_router.cpp b/pcbnew/router/pns_router.cpp
index b655ac363f..8ab4fb2fc9 100644
--- a/pcbnew/router/pns_router.cpp
+++ b/pcbnew/router/pns_router.cpp
@@ -339,9 +339,13 @@ void PNS_ROUTER::ClearWorld()
     if( m_placer )
         delete m_placer;
 
+    if( m_previewItems )
+        delete m_previewItems;
+
     m_clearanceFunc = NULL;
     m_world = NULL;
     m_placer = NULL;
+    m_previewItems = NULL;
 }