diff --git a/subjects/issorted.en.md b/subjects/issorted.en.md
index 5970788a8..97e5a23d3 100644
--- a/subjects/issorted.en.md
+++ b/subjects/issorted.en.md
@@ -12,7 +12,7 @@ To do your testing you have to write your own `f` function.
 ### Expected function
 
 ```go
-func IsSorted(f func(a, b int) int, tab []int) int {
+func IsSorted(f func(a, b int) int, tab []int) bool {
 }
 ```
 
diff --git a/subjects/issorted.fr.md b/subjects/issorted.fr.md
index 6c6471c21..031a8b294 100644
--- a/subjects/issorted.fr.md
+++ b/subjects/issorted.fr.md
@@ -11,7 +11,7 @@ Pour faire vos tests, vous devez coder votre propre fonction `f`.
 ### Fonction attendue
 
 ```go
-func IsSorted(f func(a, b int) int, tab []int) int {
+func IsSorted(f func(a, b int) int, tab []int) bool {
 }
 ```