diff --git a/Matrix_search/include/CGAL/rectangular_3_center_2_msvc.h b/Matrix_search/include/CGAL/rectangular_3_center_2_msvc.h
index 2817f050532..cc39fe4d862 100644
--- a/Matrix_search/include/CGAL/rectangular_3_center_2_msvc.h
+++ b/Matrix_search/include/CGAL/rectangular_3_center_2_msvc.h
@@ -20,6 +20,8 @@
 #if ! (CGAL_RECTANGULAR_3_CENTER_2_MSVC_H)
 #define CGAL_RECTANGULAR_3_CENTER_2_MSVC_H 1
 
+#ifdef _MSC_VER
+
 template < class R >
 struct Rectangular_3_center_2_type2_operations0 {
   typedef typename R::FT                         FT;
@@ -819,6 +821,8 @@ public:
   { return pt_b_l()(p, p, r); }
 };
 
+#endif // _MSC_VER
+
 #endif // ! (CGAL_RECTANGULAR_3_CENTER_2_MSVC_H)
 // ----------------------------------------------------------------------------
 // ** EOF