diff --git a/GeoLib/QuadTree.h b/GeoLib/QuadTree.h
index f179cb0097a7f2f927b7c048cfe6aac2e51262bc..d12915f91f1d53c9ac78c1cfbd518167b607d79d 100644
--- a/GeoLib/QuadTree.h
+++ b/GeoLib/QuadTree.h
@@ -84,7 +84,7 @@ public:
      */
     ~QuadTree()
     {
-        for (auto& child : _children)
+        for (auto const& child : _children)
         {
             delete child;
         }