diff --git a/vcg/complex/algorithms/refine.h b/vcg/complex/algorithms/refine.h
index eb91d766..6bf57be3 100644
--- a/vcg/complex/algorithms/refine.h
+++ b/vcg/complex/algorithms/refine.h
@@ -814,7 +814,7 @@ class QualityEdgePredicate
     ScalarType q0=ep.f->V0(ep.z)->Q()-thr;
     ScalarType q1=ep.f->V1(ep.z)->Q()-thr;
     if(q0>q1) std::swap(q0,q1);
-    if ( q0*q1 > 0) return false;
+    if ( q0*q1 >= 0) return false;
     // now a small check to be sure that we do not make too thin crossing.
     double pp= q0/(q0-q1);
     if ((fabs(pp)< tolerance)||(fabs(pp)> (1-tolerance))) return false;