diff --git a/src/lib/geogram/mesh/mesh_surface_intersection.cpp b/src/lib/geogram/mesh/mesh_surface_intersection.cpp
index fb16077298ea..9448a4ae9b0b 100644
--- a/src/lib/geogram/mesh/mesh_surface_intersection.cpp
+++ b/src/lib/geogram/mesh/mesh_surface_intersection.cpp
@@ -140,6 +140,9 @@ namespace {
         vec3 q3(M.vertices.point_ptr(M.facets.vertex(f2,2)));
         return triangles_intersections(p1,p2,p3,q1,q2,q3,I);
     }
+
+    static constexpr double SCALING = double(1ull << 20); 
+    static constexpr double INV_SCALING = 1.0/SCALING;
 }
 
 
diff --git a/src/lib/geogram/mesh/mesh_surface_intersection.h b/src/lib/geogram/mesh/mesh_surface_intersection.h
index 4175ba77c0a6..c8deca2a85a2 100644
--- a/src/lib/geogram/mesh/mesh_surface_intersection.h
+++ b/src/lib/geogram/mesh/mesh_surface_intersection.h
@@ -68,7 +68,7 @@
 
 namespace GEO {
 
-    class IsectInfo;
+    struct IsectInfo;
 
     /********************************************************************/
 
@@ -566,8 +566,6 @@ namespace GEO {
         bool detect_intersecting_neighbors_;
         bool use_radial_sort_;
 
-        static constexpr double SCALING = double(1ull << 20); 
-        static constexpr double INV_SCALING = 1.0/SCALING;
         PCK::SOSMode SOS_bkp_;
         bool normalize_;
         vec3 normalize_center_;