diff --git a/src/corelib/tools/qmap.h b/src/corelib/tools/qmap.h
index 3f4f034b4e..da77ba4458 100644
--- a/src/corelib/tools/qmap.h
+++ b/src/corelib/tools/qmap.h
@@ -209,8 +209,10 @@ struct QMapData : public QMapDataBase
 
     Node *root() const { return static_cast<Node *>(header.left); }
 
-    const Node *end() const { return static_cast<const Node *>(&header); }
-    Node *end() { return static_cast<Node *>(&header); }
+    // using reinterpret_cast because QMapDataBase::header is not
+    // actually a QMapNode.
+    const Node *end() const { return reinterpret_cast<const Node *>(&header); }
+    Node *end() { return reinterpret_cast<Node *>(&header); }
     const Node *begin() const { if (root()) return static_cast<const Node*>(mostLeftNode); return end(); }
     Node *begin() { if (root()) return static_cast<Node*>(mostLeftNode); return end(); }