diff --git a/Surface_sweep_2/include/CGAL/Surface_sweep_2/Default_event_base.h b/Surface_sweep_2/include/CGAL/Surface_sweep_2/Default_event_base.h
index 51f864725bd..c206e4ac6e6 100644
--- a/Surface_sweep_2/include/CGAL/Surface_sweep_2/Default_event_base.h
+++ b/Surface_sweep_2/include/CGAL/Surface_sweep_2/Default_event_base.h
@@ -187,7 +187,7 @@ public:
     for (Subcurve_iterator iter = this->left_curves_begin();
          iter != this->left_curves_end(); ++iter)
     {
-      if ((curve == *iter)) {
+      if (curve == *iter) {
         this->left_curves_erase(iter);
         return;
       }