diff --git a/Mesh/directions3D.h b/Mesh/directions3D.h
index 357a9fb74e2b8ec9a54ca1ae52ad07fb4389dac2..2ba49e6ab1f6ff875d4c268d9ec23e0053488b58 100644
--- a/Mesh/directions3D.h
+++ b/Mesh/directions3D.h
@@ -72,7 +72,7 @@ class Size_field{
   static void solve(GRegion*);
   static double search(double,double,double);
   static double get_ratio(GFace*,SPoint2);
-  static void print_field(GRegion* gr);
+  static void print_field(GRegion*);
   static GRegion* test();
   static void clear();
 };