diff --git a/web/app/brep/geom/impl/nurbs-impl.js b/web/app/brep/geom/impl/nurbs-impl.js
index b81bddc8..4588b010 100644
--- a/web/app/brep/geom/impl/nurbs-impl.js
+++ b/web/app/brep/geom/impl/nurbs-impl.js
@@ -113,9 +113,7 @@ export function curveClosestParam(curve, point) {
   return verb.eval.Analyze.rationalCurveClosestParam(curve, point);
 }
 
-export function verb_surface_isec(nurbs1, nurbs2) {
-  const surface0 = nurbs1.asNurbs();
-  const surface1 = nurbs2.asNurbs();
+export function surfaceIntersect(surface0, surface1) {
   const tess1 = verb.eval.Tess.rationalSurfaceAdaptive(surface0);
   const tess2 = verb.eval.Tess.rationalSurfaceAdaptive(surface1);
   const resApprox = verb.eval.Intersect.meshes(tess1,tess2);
@@ -127,11 +125,15 @@ export function verb_surface_isec(nurbs1, nurbs2) {
   return exactPls.map(function(x) {
     return verb.eval.Make.rationalInterpCurve(x.map(function(y) {
       return y.point;
-    }), x.length - 1);
+    }), surfaceMaxDegree(surface0) === 1 && surfaceMaxDegree(surface1) === 1 ? 1 : x.length - 1);
   }).map(cd => new verb.geom.NurbsCurve(cd));
 }
 
-export function verb_curve_isec(curve1, curve2) {
+export function surfaceMaxDegree(surface) {
+  return Math.max(surface.degreeU, surface.degreeV);
+}
+
+export function curveIntersect(curve1, curve2) {
 
   let result = [];
   let segs1 = curveTessellate(curve1);
diff --git a/web/app/brep/geom/impl/nurbs.js b/web/app/brep/geom/impl/nurbs.js
index 5e36e3f8..17c6ba4e 100644
--- a/web/app/brep/geom/impl/nurbs.js
+++ b/web/app/brep/geom/impl/nurbs.js
@@ -118,7 +118,7 @@ export class NurbsCurve extends Curve {
     isecOn(other, this, 0);
     isecOn(other, this, 1);
 
-    impl.verb_curve_isec(this.data, other.data, tol).forEach( i => add({
+    impl.curveIntersect(this.data, other.data, tol).forEach(i => add({
       u0: i.u0,
       u1: i.u1,
       p0: i.point0,
@@ -149,6 +149,7 @@ export class NurbsSurface extends Surface {
 
   constructor(verbSurface, inverted) {
     super();
+    this.data = verbSurface.asNurbs();
     this.verb = verbSurface;
     this.inverted = inverted === true;
     this.mirrored = NurbsSurface.isMirrored(this);
@@ -217,7 +218,7 @@ export class NurbsSurface extends Surface {
   }
 
   intersectSurfaceForSameClass(other, tol) {
-    const curves = impl.verb_surface_isec(this.verb, other.verb, tol);
+    const curves = impl.surfaceIntersect(this.data, other.data, tol);
     let inverted = this.inverted !== other.inverted;
     return curves.map(curve => new NurbsCurve(inverted ?  curve.reverse() : curve));
   }