diff --git a/src/mesh/mesh_to_curve.cpp b/src/mesh/mesh_to_curve.cpp
index 2879f77..5f65669 100644
--- a/src/mesh/mesh_to_curve.cpp
+++ b/src/mesh/mesh_to_curve.cpp
@@ -453,7 +453,8 @@ std::vector<curves::NurbsCurve> mesh_contour_to_curves(
             cur = next;
         }
         if (comp.size() >= 3) {
-            // Don't add closing duplicate — LS fitting handles closure internally
+            // Close the loop for fitting
+            comp.push_back(comp[0]);
             components.push_back(std::move(comp));
         }
     }