diff --git a/src/java-jpa-entity.js b/src/java-jpa-entity.js
index 9acdf1f..d5ae407 100644
--- a/src/java-jpa-entity.js
+++ b/src/java-jpa-entity.js
@@ -27,7 +27,7 @@ module.exports = {
                 field.default = javaType.mapDefaultValue(field.type, field.default)
                 field.nullable = !field.required
                 field.isPkey = jpa.pkey == field.name
-                field.unique = field_attr.unique
+                field.unique = field_attr.unique || false
                 field.creationTimestamp = field_attr.timestamp == 'create'
                 field.updateTimestamp = field_attr.timestamp == 'update'
                 field.id_generator = jpa.id_generator