diff --git a/src/build123d/topology/one_d.py b/src/build123d/topology/one_d.py
index 08e2600d..35fec1f6 100644
--- a/src/build123d/topology/one_d.py
+++ b/src/build123d/topology/one_d.py
@@ -307,6 +307,9 @@ def _solve_wire_fillet_corner_chfi2d(
         corner.connected_edges[1].wrapped,
         Plane.XY.wrapped,
     )
+  
+    if not fillet_builder.Perform(radius):
+        radius -= 1e-11
 
     vertex_point = BRep_Tool.Pnt_s(corner.vertex.wrapped)
     if (