diff --git a/src/catala/default_calculus/interpreter.ml b/src/catala/default_calculus/interpreter.ml
index 2c559eb9..fdec4bb7 100644
--- a/src/catala/default_calculus/interpreter.ml
+++ b/src/catala/default_calculus/interpreter.ml
@@ -134,9 +134,7 @@ let rec evaluate_expr (e : A.expr Pos.marked) : A.expr Pos.marked =
                     ] )
                 @ List.map
                     (fun (_, sub) ->
-                      ( Some
-                          "This value is available because the justification of its definition is \
-                           true:",
+                      ( Some "This value is available because this justification is true:",
                         Pos.get_position sub ))
                     (List.filter
                        (fun (sub, _) -> not (is_empty_error sub))
diff --git a/tests/test_func/func.catala b/tests/test_func/func.catala
index 0aab0c9e..979f2e83 100644
--- a/tests/test_func/func.catala
+++ b/tests/test_func/func.catala
@@ -3,22 +3,20 @@
 /*
 new scope S:
   param f type int fun of int
-  param x type int
   param b type bool
+  param out type int
 
 new scope R:
   param s scope S
   param r type int
 
 scope S:
-  def f of x1 [ (x1 >= x1) ] := x1 + x1
-  def f of x2 [ not b ] := x2 * x2
-
+  def f of x [ (x >= x) ] := x + x
+  def f of x [ not b ] := x * x
   def b := false
-
-  def x := f of 3
+  def out := f of 5
 
 scope R:
   def s.f of x := x + x * x 
-  def r := s.f of 5
+  def r := s.out
 */
diff --git a/tests/test_func/func.catala.S.out b/tests/test_func/func.catala.S.out
index ff08bb03..f78d0c87 100644
--- a/tests/test_func/func.catala.S.out
+++ b/tests/test_func/func.catala.S.out
@@ -3,11 +3,11 @@
 [ERROR] This value is available because the justification of its definition is true:
 [ERROR]   --> test_func/func.catala
 [ERROR]    | 
-[ERROR] 14 |   def f of x1 [ (x1 >= x1) ] := x1 + x1
-[ERROR]    |                  ^^^^^^^^
+[ERROR] 14 |   def f of x [ (x >= x) ] := x + x
+[ERROR]    |                 ^^^^^^
 [ERROR] 
 [ERROR] This value is available because the justification of its definition is true:
 [ERROR]   --> test_func/func.catala
 [ERROR]    | 
-[ERROR] 15 |   def f of x2 [ not b ] := x2 * x2
-[ERROR]    |                 ^^^^^
+[ERROR] 15 |   def f of x [ not b ] := x * x
+[ERROR]    |                ^^^^^