diff --git a/src/generic/grid.cpp b/src/generic/grid.cpp
index f67bd960b8..1dca09bd95 100644
--- a/src/generic/grid.cpp
+++ b/src/generic/grid.cpp
@@ -10251,7 +10251,7 @@ wxGridSelectionRange wxGrid::GetSelectionRange() const
     if ( !m_selection )
         return wxGridSelectionRange();
 
-    wxVectorGridBlockCoords& blocks = m_selection->GetBlocks();
+    const wxVectorGridBlockCoords& blocks = m_selection->GetBlocks();
     return wxGridSelectionRange(blocks.begin(), blocks.end());
 }