diff --git a/tutorial/t13.geo b/tutorial/t13.geo
index 61edda77b7c52ef7f0a49275ab779a1c8e38db6a..a608717b210c4285ae87ce7e4e47751f5031d4ea 100644
--- a/tutorial/t13.geo
+++ b/tutorial/t13.geo
@@ -43,7 +43,7 @@ Physical Line(1) = {26 ... 37};
 
 // element size imposed by a size field
 Field[1] = MathEval;
-Field[1].F = "2.5";
+Field[1].F = "2.0";
 Background Field = 1;
 
 DefineConstant[