diff --git a/Spatial_searching/include/CGAL/Kd_tree_node.h b/Spatial_searching/include/CGAL/Kd_tree_node.h
index 36060e868a8..02af0663d6a 100644
--- a/Spatial_searching/include/CGAL/Kd_tree_node.h
+++ b/Spatial_searching/include/CGAL/Kd_tree_node.h
@@ -15,7 +15,6 @@
 
 #include <CGAL/license/Spatial_searching.h>
 
-#include <string>
 #include <unordered_map>
 #include <ostream>