diff --git a/admin/sync/exercice_keys.go b/admin/sync/exercice_keys.go
index a5a3bae4..b4229331 100644
--- a/admin/sync/exercice_keys.go
+++ b/admin/sync/exercice_keys.go
@@ -119,7 +119,7 @@ func SyncExerciceFlags(i Importer, exercice fic.Exercice) (errs []string) {
 				// Import dependency to flag
 				for _, nf := range flag.NeedFlag {
 					if rf, ok := kmap[nf.Id]; !ok {
-						errs = append(errs, fmt.Sprintf("%q: error flag #%d dependency to flag id=%s: id not defined, perhaps not available at time of processing", path.Base(exercice.Path), nline + 1, nf.Id))
+						errs = append(errs, fmt.Sprintf("%q: error flag #%d dependency to flag id=%d: id not defined, perhaps not available at time of processing", path.Base(exercice.Path), nline + 1, nf.Id))
 						continue
 					} else if err := k.AddDepend(rf); err != nil {
 						errs = append(errs, fmt.Sprintf("%q: error flag #%d dependency to %s: %s", path.Base(exercice.Path), nline + 1, nf.Id, err))