diff --git a/Spatial_searching/include/CGAL/Search_traits.h b/Spatial_searching/include/CGAL/Search_traits.h
index 4f856c0db49..26f12e87e76 100644
--- a/Spatial_searching/include/CGAL/Search_traits.h
+++ b/Spatial_searching/include/CGAL/Search_traits.h
@@ -21,7 +21,7 @@
 
 #ifndef CGAL_KD_TREE_TRAITS_POINT_H
 #define CGAL_KD_TREE_TRAITS_POINT_H
-#include <CGAL\Dimension.h>
+#include <CGAL/Dimension.h>
 
 
 namespace CGAL {
diff --git a/Spatial_searching/include/CGAL/Search_traits_2.h b/Spatial_searching/include/CGAL/Search_traits_2.h
index 07e80e3331f..b3236cbc902 100644
--- a/Spatial_searching/include/CGAL/Search_traits_2.h
+++ b/Spatial_searching/include/CGAL/Search_traits_2.h
@@ -21,7 +21,7 @@
 
 #ifndef CGAL_SEARCH_TRAITS_2_H
 #define CGAL_SEARCH_TRAITS_2_H
-#include <CGAL\Dimension.h>
+#include <CGAL/Dimension.h>
 
 namespace CGAL {
 
diff --git a/Spatial_searching/include/CGAL/Search_traits_3.h b/Spatial_searching/include/CGAL/Search_traits_3.h
index 8cd8bf3d49e..a92dd9e2dad 100644
--- a/Spatial_searching/include/CGAL/Search_traits_3.h
+++ b/Spatial_searching/include/CGAL/Search_traits_3.h
@@ -21,7 +21,7 @@
 
 #ifndef CGAL_SEARCH_TRAITS_3_H
 #define CGAL_SEARCH_TRAITS_3_H
-#include <CGAL\Dimension.h>
+#include <CGAL/Dimension.h>
 
 namespace CGAL {