--- a/src/nubspline_create.c
+++ b/src/nubspline_create.c
@@ -1084,5 +1084,6 @@ destroy_NUBspline(Bspline *spline)
     destroy_NUBasis (((NUBspline_3d*)spline)->z_basis);
     break;
   }
+  free (spline);
 }