diff --git a/admin/sync/exercices.go b/admin/sync/exercices.go
index 55686757..afe43038 100644
--- a/admin/sync/exercices.go
+++ b/admin/sync/exercices.go
@@ -32,7 +32,7 @@ func GetExercices(i Importer, theme fic.Theme) ([]string, error) {
 	} else {
 		for _, dir := range dirs {
 			if _, err := i.listDir(path.Join(theme.Path, dir)); err == nil {
-				if dir[0] != '.' {
+				if dir[0] != '.' && strings.Contains(dir, "-") {
 					exercices = append(exercices, dir)
 				}
 			}