diff --git a/eeschema/tools/sch_drawing_tools.cpp b/eeschema/tools/sch_drawing_tools.cpp
index b542848316..9686d980ad 100644
--- a/eeschema/tools/sch_drawing_tools.cpp
+++ b/eeschema/tools/sch_drawing_tools.cpp
@@ -275,7 +275,7 @@ int SCH_DRAWING_TOOLS::PlacePower( const TOOL_EVENT& aEvent )
 
 
 int SCH_DRAWING_TOOLS::doPlaceComponent( SCH_COMPONENT* aComponent, SCHLIB_FILTER* aFilter,
-                                         SCH_BASE_FRAME::HISTORY_LIST aHistoryList )
+                                         SCH_BASE_FRAME::HISTORY_LIST& aHistoryList )
 {
     VECTOR2I cursorPos = getViewControls()->GetCursorPosition();
     getViewControls()->ShowCursor( true );
diff --git a/eeschema/tools/sch_drawing_tools.h b/eeschema/tools/sch_drawing_tools.h
index 856f7b12db..01c7a9598c 100644
--- a/eeschema/tools/sch_drawing_tools.h
+++ b/eeschema/tools/sch_drawing_tools.h
@@ -73,7 +73,7 @@ public:
 private:
 
     int doPlaceComponent( SCH_COMPONENT* aComponent, SCHLIB_FILTER* aFilter,
-                          SCH_BASE_FRAME::HISTORY_LIST aHistoryList );
+                          SCH_BASE_FRAME::HISTORY_LIST& aHistoryList );
 
     int doSingleClickPlace( KICAD_T aType );