diff --git a/repochecker/epita/flags.go b/repochecker/epita/flags.go
index 433354da..94a2b8f5 100644
--- a/repochecker/epita/flags.go
+++ b/repochecker/epita/flags.go
@@ -19,7 +19,8 @@ func EPITACheckKeyFlag(flag *fic.FlagKey, raw string, _ *fic.Exercice, exception
 		flag.Label = flag.Label[1:]
 	}
 
-	if flag.Label[len(flag.Label)-1] != ')' && flag.Label[len(flag.Label)-1] != '©' && !unicode.IsLetter(rune(flag.Label[len(flag.Label)-1])) && !unicode.IsDigit(rune(flag.Label[len(flag.Label)-1])) {
+	label := []rune(flag.Label)
+	if flag.Label[len(flag.Label)-1] != ')' && flag.Label[len(flag.Label)-1] != '©' && !unicode.IsLetter(label[len(label)-1]) && !unicode.IsDigit(label[len(label)-1]) {
 		errs = multierr.Append(errs, fmt.Errorf("Label should not end with punct (%q). Reword your label as a description of the expected flag, `:` are automatically appended.", flag.Label[len(flag.Label)-1]))
 	}