diff --git a/rounding.scad b/rounding.scad
index 62f481c..958db31 100644
--- a/rounding.scad
+++ b/rounding.scad
@@ -329,7 +329,7 @@ function _circlecorner(points, parm) =
                         start = points[1]+prev*d,
                         end = points[1]+next*d
         )     // 90-angle is half the angle of the circular arc
-        arc(max(3,(90-angle)/180*segs(r)), cp=center, points=[start,end]);
+        arc(max(3,ceil((90-angle)/180*segs(r))), cp=center, points=[start,end]);
 
 
 // Used by offset_sweep and convex_offset_extrude: