diff --git a/Nef_3/test/Nef_3/issue8644.cpp b/Nef_3/test/Nef_3/issue8644.cpp
index f2182788dac7..40b3ac15f473 100644
--- a/Nef_3/test/Nef_3/issue8644.cpp
+++ b/Nef_3/test/Nef_3/issue8644.cpp
@@ -8,7 +8,7 @@
 #include <CGAL/Polygon_mesh_processing/orientation.h>
 #include <CGAL/Nef_polyhedron_3.h>
 
-#define DATA_DIR  std::string("./")+
+#define DATA_DIR  std::string("./data/")+
 
 ///////////////////////////////////////////////////////////////////////////////
 using AFT=CGAL::Exact_rational; //CGAL::Gmpzf; CGAL::Exact_rational CGAL::Exact_integer