diff --git a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_4.h b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_4.h
index 883e1baa797..f37646ed068 100644
--- a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_4.h
+++ b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_4.h
@@ -92,7 +92,7 @@ double m01;
     double m34;
     m34 = (t3 - p3);
     double det;
-    det = determinant( m01, m02, m03, m04, m11, m12, m13, m14, m21, m22, m23, m24, m31, m32, m33, m34 );
+    det = ::CGAL::determinant( m01, m02, m03, m04, m11, m12, m13, m14, m21, m22, m23, m24, m31, m32, m33, m34 );
     int int_tmp_result;
     double eps;
     double max1 = CGAL::abs(m01);
diff --git a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_5.h b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_5.h
index 729608c0052..8555f6f823c 100644
--- a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_5.h
+++ b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_5.h
@@ -114,7 +114,7 @@ public:
     double m45;
     m45 = (u4 - p4);
     double det;
-    det = determinant( m01, m02, m03, m04, m05, m11, m12, m13, m14, m15, m21, m22, m23, m24, m25, m31, m32, m33, m34, m35, m41, m42, m43, m44, m45 );
+    det = ::CGAL::determinant( m01, m02, m03, m04, m05, m11, m12, m13, m14, m15, m21, m22, m23, m24, m25, m31, m32, m33, m34, m35, m41, m42, m43, m44, m45 );
     int int_tmp_result;
     double eps;
     double max1 = CGAL::abs(m01);
diff --git a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_6.h b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_6.h
index 64780101571..89425ffd333 100644
--- a/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_6.h
+++ b/Filtered_kernel/include/CGAL/Filtered_kernel/internal/Static_filters/Orientation_6.h
@@ -149,7 +149,7 @@ public:
     double m56;
     m56 = (v5 - p5);
     double det;
-    det = determinant( m01, m02, m03, m04, m05, m06, m11, m12, m13, m14, m15, m16, m21, m22, m23, m24, m25, m26, m31, m32, m33, m34, m35, m36, m41, m42, m43, m44, m45, m46, m51, m52, m53, m54, m55, m56 );
+    det = ::CGAL::determinant( m01, m02, m03, m04, m05, m06, m11, m12, m13, m14, m15, m16, m21, m22, m23, m24, m25, m26, m31, m32, m33, m34, m35, m36, m41, m42, m43, m44, m45, m46, m51, m52, m53, m54, m55, m56 );
     int int_tmp_result;
     double eps;
     double max1 = CGAL::abs(m01);
@@ -267,6 +267,7 @@ public:
     am = CGAL::abs(m52);
     if( (max6 < am) ) { max6 = am; }
     am = CGAL::abs(m53);
+    am = CGAL::abs(m53);
     if( (max6 < am) ) { max6 = am; }