diff --git a/Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/topologically_correct_marching_cubes_functors.h b/Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/topologically_correct_marching_cubes_functors.h
index 3b1a9363b4e..0e59422f7ee 100644
--- a/Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/topologically_correct_marching_cubes_functors.h
+++ b/Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/topologically_correct_marching_cubes_functors.h
@@ -996,7 +996,7 @@ private:
         // triangulate and close inner hexagon
         // triangle must have the correct orientation
         // use asymptotic_decider() to see if positive vertices
-        // are separated, in thic case orientation must be changed
+        // are separated, in this case orientation must be changed
         const bool s_ = (asymptotic_decider(values[0], values[1], values[2], values[3]) <= i0);
         const bool of_ = (wi[1] < wi[0]) ? s_ : !s_;