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-rw-r--r--src/2geom/sbasis-geometric.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/2geom/sbasis-geometric.cpp b/src/2geom/sbasis-geometric.cpp
index 19eccc451..3fe27748e 100644
--- a/src/2geom/sbasis-geometric.cpp
+++ b/src/2geom/sbasis-geometric.cpp
@@ -227,7 +227,7 @@ Geom::unitVector(D2<SBasis> const &V_in, double tol, unsigned order){
// -This approach is numerically bad. Find a stable way to rescale V_in to have non vanishing ends.
// -This done, unitVector will have jumps at zeros: fill the gaps with arcs of circles.
D2<SBasis> V = RescaleForNonVanishingEnds(V_in);
- if (V[0].isZero(0) && V[1].isZero(0))
+ if (V[0].isZero(tol) && V[1].isZero(tol))
return Piecewise<D2<SBasis> >(D2<SBasis>(Linear(1),SBasis()));
SBasis x = V[0], y = V[1];