diff --git a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h
index 1676471f913..c9d84653e26 100644
--- a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h
+++ b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h
@@ -1509,7 +1509,7 @@ long Fujiwara_root_bound_log(
     RandomAccessIterator first, RandomAccessIterator beyond,
     LowerBoundLog2Abs lblog2, UpperBoundLog2AbsApproximator ublog2apx
 ) {
-  std::ptrdiff_t n = beyond - first - 1; // degree
+    std::ptrdiff_t n = beyond - first - 1; // degree
     if (n < 1) return 0;
     long lblog2_lcoeff = lblog2(*(beyond - 1));
 
diff --git a/Boolean_set_operations_2/include/CGAL/General_polygon_set_2.h b/Boolean_set_operations_2/include/CGAL/General_polygon_set_2.h
index 33e3fa40552..f18e06b9ee8 100644
--- a/Boolean_set_operations_2/include/CGAL/General_polygon_set_2.h
+++ b/Boolean_set_operations_2/include/CGAL/General_polygon_set_2.h
@@ -118,6 +118,6 @@ public:
 
 } //namespace CGAL
 
-#include <CGAL/disable_warnings.h>
+#include <CGAL/enable_warnings.h>
 
 #endif
diff --git a/Surface_mesh_parameterization/include/CGAL/Surface_mesh_parameterization/Fixed_border_parameterizer_3.h b/Surface_mesh_parameterization/include/CGAL/Surface_mesh_parameterization/Fixed_border_parameterizer_3.h
index 745bd1d9be0..a1d7a824fbe 100644
--- a/Surface_mesh_parameterization/include/CGAL/Surface_mesh_parameterization/Fixed_border_parameterizer_3.h
+++ b/Surface_mesh_parameterization/include/CGAL/Surface_mesh_parameterization/Fixed_border_parameterizer_3.h
@@ -420,6 +420,6 @@ private:
 
 } // namespace CGAL
 
-#include <CGAL/disable_warnings.h>
+#include <CGAL/enable_warnings.h>
 
 #endif // CGAL_SURFACE_MESH_PARAMETERIZATION_FIXED_BORDER_PARAMETERIZER_3_H
diff --git a/Surface_mesher/include/CGAL/Surface_mesher/Surface_mesher_manifold.h b/Surface_mesher/include/CGAL/Surface_mesher/Surface_mesher_manifold.h
index 2570b5896c0..1dc99bde68f 100644
--- a/Surface_mesher/include/CGAL/Surface_mesher/Surface_mesher_manifold.h
+++ b/Surface_mesher/include/CGAL/Surface_mesher/Surface_mesher_manifold.h
@@ -242,6 +242,6 @@ namespace CGAL {
 
 }  // end namespace CGAL
 
-#include <CGAL/disable_warnings.h>
+#include <CGAL/enable_warnings.h>
 
 #endif // CGAL_SURFACE_MESHER_MANIFOLD_H