diff --git a/pcbnew/router/length_tuner_tool.cpp b/pcbnew/router/length_tuner_tool.cpp
index cd44879c6a..b3f54feb9e 100644
--- a/pcbnew/router/length_tuner_tool.cpp
+++ b/pcbnew/router/length_tuner_tool.cpp
@@ -150,7 +150,9 @@ void LENGTH_TUNER_TOOL::performTuning()
     controls()->ForceCursorPosition( false );
     controls()->SetAutoPan( true );
 
-    if( !m_router->StartRouting( m_startSnapPoint, m_startItem, 0 ) )
+    int layer = m_startItem ? m_startItem->Layer() : static_cast<int>( frame()->GetActiveLayer() );
+
+    if( !m_router->StartRouting( m_startSnapPoint, m_startItem, layer ) )
     {
         frame()->ShowInfoBarMsg( m_router->FailureReason() );
         highlightNet( false );