diff --git a/Circular_kernel_3/test/Circular_kernel_3/include/CGAL/_test_sphere_constructions.h b/Circular_kernel_3/test/Circular_kernel_3/include/CGAL/_test_sphere_constructions.h
index b24106d8fac..fb554468eec 100644
--- a/Circular_kernel_3/test/Circular_kernel_3/include/CGAL/_test_sphere_constructions.h
+++ b/Circular_kernel_3/test/Circular_kernel_3/include/CGAL/_test_sphere_constructions.h
@@ -756,7 +756,7 @@ void _test_intersection_construct(SK sk) {
           intersection(s1, s2, sl, std::back_inserter(intersection_1));
           intersection(s1, s3, sl, std::back_inserter(intersection_2));
           if(intersection_1.size() == 1) {
-	          assert(do_intersect(s1, s2, sl));
+            assert(CGAL::do_intersect(s1, s2, sl));
             Circle_3 circle;
             std::pair<Circular_arc_point_3, unsigned> cap;
             if(assign(circle,intersection_1[0])) {
@@ -772,7 +772,7 @@ void _test_intersection_construct(SK sk) {
             }
           }
           if(intersection_1.size() == 2) {
-	          assert(do_intersect(s1, s2, sl));
+            assert(CGAL::do_intersect(s1, s2, sl));
             std::pair<Circular_arc_point_3, unsigned> cap1, cap2;
             assert(assign(cap1,intersection_1[0]));
             assert(assign(cap2,intersection_1[1]));
@@ -785,7 +785,7 @@ void _test_intersection_construct(SK sk) {
           }
 
           if(intersection_2.size() == 1) {
-	          assert(do_intersect(s1, s3, sl));
+            assert(CGAL::do_intersect(s1, s3, sl));
             Circle_3 circle;
             std::pair<Circular_arc_point_3, unsigned> cap;
             if(assign(circle,intersection_2[0])) {
@@ -801,7 +801,7 @@ void _test_intersection_construct(SK sk) {
             }
           }
           if(intersection_2.size() == 2) {
-	          assert(do_intersect(s1, s3, sl));
+            assert(CGAL::do_intersect(s1, s3, sl));
             // This case must never happen
             std::pair<Circular_arc_point_3, unsigned> cap1, cap2;
             assert(assign(cap1,intersection_2[0]));
diff --git a/Kernel_23/include/CGAL/internal/Projection_traits_3.h b/Kernel_23/include/CGAL/internal/Projection_traits_3.h
index e42d99d7dc2..038ed4f0097 100644
--- a/Kernel_23/include/CGAL/internal/Projection_traits_3.h
+++ b/Kernel_23/include/CGAL/internal/Projection_traits_3.h
@@ -376,12 +376,12 @@ class Circumcenter_center_projected
 public:
   Point_3 operator() (const Point_3& p1,const Point_3& p2) const
   {
-    return embed( circumcenter(project(p1),project(p2)) );
+    return embed( CGAL::circumcenter(project(p1),project(p2)) );
   }
 
   Point_3 operator() (const Point_3& p1,const Point_3& p2,const Point_3& p3) const
   {
-    return embed( circumcenter(project(p1),project(p2),project(p3)) );
+    return embed( CGAL::circumcenter(project(p1),project(p2),project(p3)) );
   }
 };
 
diff --git a/Kernel_23/test/Kernel_23/issue_129.cpp b/Kernel_23/test/Kernel_23/issue_129.cpp
index afc22f4d3dc..dda0cabc3d9 100644
--- a/Kernel_23/test/Kernel_23/issue_129.cpp
+++ b/Kernel_23/test/Kernel_23/issue_129.cpp
@@ -27,7 +27,7 @@ int main()
 {
   try {
     CGAL::Point_3<CGAL::Epick> a, b, c, d;
-    squared_radius(a, b, c, d);
+    CGAL::squared_radius(a, b, c, d);
   } catch(...) {}
   return EXIT_SUCCESS;
 }