diff --git a/backend/src/tangent_vectors_geom_bspline.cpp b/backend/src/tangent_vectors_geom_bspline.cpp
index 4f4f309..1e4ec12 100644
--- a/backend/src/tangent_vectors_geom_bspline.cpp
+++ b/backend/src/tangent_vectors_geom_bspline.cpp
@@ -14,7 +14,6 @@ std::vector<gp_Vec> calculate_tangent_vectors(const Handle(Geom_BSplineCurve)& b
     gp_Pnt point;
     int knots = bsplineCurve->NbKnots();
     Standard_Real step_size = 1 / knots;
-    TColStd_Array1OfReal knotsArray(1, knots);
     Standard_Real first_parameter = bsplineCurve->FirstParameter();
     Standard_Real last_parameter = bsplineCurve->LastParameter();
     for (int u = first_parameter; u < last_parameter; u += step_size) {