diff --git a/migration/migration.c b/migration/migration.c
index d0a0f68f11..2865ae3fa9 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1728,7 +1728,7 @@ int migrate_add_blocker(Error *reason, Error **errp)
     if (only_migratable) {
         error_propagate_prepend(errp, error_copy(reason),
                                 "disallowing migration blocker "
-                                "(--only_migratable) for: ");
+                                "(--only-migratable) for: ");
         return -EACCES;
     }