diff --git a/libsrc/gprim/geomtest3d.hpp b/libsrc/gprim/geomtest3d.hpp
index b26c9b41..954d32e7 100644
--- a/libsrc/gprim/geomtest3d.hpp
+++ b/libsrc/gprim/geomtest3d.hpp
@@ -69,10 +69,10 @@ extern double ComputeCylinderRadius (const Vec3d & n1, const Vec3d & n2,
 				     double h1, double h2);
 
 /// Minimal distance of point p to the line segment [lp1,lp2]
-extern double MinDistLP2 (const Point2d & lp1, const Point2d & lp2, const Point2d & p);
+DLL_HEADER double MinDistLP2 (const Point2d & lp1, const Point2d & lp2, const Point2d & p);
 
 /// Minimal distance of point p to the line segment [lp1,lp2]
-extern double MinDistLP2 (const Point3d & lp1, const Point3d & lp2, const Point3d & p);
+DLL_HEADER double MinDistLP2 (const Point3d & lp1, const Point3d & lp2, const Point3d & p);
 
 /// Minimal distance of point p to the triangle segment [tp1,tp2,pt3]
 DLL_HEADER double MinDistTP2 (const Point3d & tp1, const Point3d & tp2,