diff --git a/tutorial/t12.geo b/tutorial/t12.geo
index 9cd5194a88aa6d0fee685b7fd1a40b3caa572054..02bfa065cf938bae1f529066e03c5dd37e3b5e8b 100644
--- a/tutorial/t12.geo
+++ b/tutorial/t12.geo
@@ -46,6 +46,8 @@ Compound Line(101) = {6, 7, 8};
 // Treat surfaces 12, 14 and 16 as a single surface
 Compound Surface(200) = {12, 14, 16};
 
+Hide {Surface{12, 14, 16}; }
+
 // More details about the reparametrization technique can be found in
 // the following papers:
 //
diff --git a/tutorial/t13.geo b/tutorial/t13.geo
index be64a48eb0fedec0b7fbbc4228d555f26a94d734..b9c2d9facd7f7c24072771a9d9a8ffed4de6c78a 100644
--- a/tutorial/t13.geo
+++ b/tutorial/t13.geo
@@ -43,7 +43,7 @@ Physical Volume(1) = 1;
 
 // Apply a funny mesh size field, just because we can :-)
 Field[1] = MathEval;
-Field[1].F = "2*Sin((x+y)/5) + 3.3";
+Field[1].F = "2*Sin((x+y)/5) + 3";
 Background Field = 1;
 
 Mesh.RemeshAlgorithm = 1; // (0) no split (1) automatic (2) automatic only with metis