diff --git a/eeschema/sch_marker.cpp b/eeschema/sch_marker.cpp
index 98558801bc..0fb568b9f1 100644
--- a/eeschema/sch_marker.cpp
+++ b/eeschema/sch_marker.cpp
@@ -109,7 +109,7 @@ wxString SCH_MARKER::SerializeToString() const
 }
 
 
-SCH_MARKER* SCH_MARKER::DeserializeFromString( const SCH_SHEET_LIST aSheetList, const wxString& data )
+SCH_MARKER* SCH_MARKER::DeserializeFromString( const SCH_SHEET_LIST& aSheetList, const wxString& data )
 {
     wxArrayString props = wxSplit( data, '|' );
     VECTOR2I      markerPos( (int) strtol( props[1].c_str(), nullptr, 10 ),
diff --git a/eeschema/sch_marker.h b/eeschema/sch_marker.h
index 840ce5f73a..837636098e 100644
--- a/eeschema/sch_marker.h
+++ b/eeschema/sch_marker.h
@@ -54,7 +54,7 @@ public:
     void SwapData( SCH_ITEM* aItem ) override;
 
     wxString SerializeToString() const;
-    static SCH_MARKER* DeserializeFromString( const SCH_SHEET_LIST aSheetList, const wxString& data );
+    static SCH_MARKER* DeserializeFromString( const SCH_SHEET_LIST& aSheetList, const wxString& data );
 
     void ViewGetLayers( int aLayers[], int& aCount ) const override;