diff --git a/libsrc/gprim/spline.cpp b/libsrc/gprim/spline.cpp
index a2778d91..4a17da71 100644
--- a/libsrc/gprim/spline.cpp
+++ b/libsrc/gprim/spline.cpp
@@ -98,6 +98,16 @@ namespace netgen
     proj_latest_t = 0.5;
   }
 
+  template<int D>
+  SplineSeg3<D> :: SplineSeg3 (const GeomPoint<D> & ap1,
+			       const GeomPoint<D> & ap2,
+			       const GeomPoint<D> & ap3,
+                               double aweight)
+    : p1(ap1), p2(ap2), p3(ap3), weight(aweight)
+  {
+    proj_latest_t = 0.5;
+  }
+
   template<int D>
   Point<D> SplineSeg3<D> :: GetPoint (double t) const
   {
diff --git a/libsrc/gprim/spline.hpp b/libsrc/gprim/spline.hpp
index 6549587d..d2ba6f4e 100644
--- a/libsrc/gprim/spline.hpp
+++ b/libsrc/gprim/spline.hpp
@@ -185,6 +185,10 @@ namespace netgen
     SplineSeg3 (const GeomPoint<D> & ap1, 
 		const GeomPoint<D> & ap2, 
 		const GeomPoint<D> & ap3);
+    SplineSeg3 (const GeomPoint<D> & ap1,
+		const GeomPoint<D> & ap2,
+		const GeomPoint<D> & ap3,
+                double aweight);
     // default constructor for archive
     SplineSeg3() {}
     ///