1 files changed, 3 insertions, 11 deletions
diff --git a/src/qtjsonschema/checkpoints_p.h b/src/qtjsonschema/checkpoints_p.h
index 64e21b8..081f895 100644
--- a/src/qtjsonschema/checkpoints_p.h
+++ b/src/qtjsonschema/checkpoints_p.h
@@ -313,21 +313,13 @@ public:
             return false;
 
         if (Check::m_data->m_flags.testFlag(CheckSharedData::NoAdditionalProperties)) {
-            QList<Key> strsSchemaProperties(m_checks.keys());
             QList<Key> strsObjectProperties(object.propertyNames());
-            if (strsSchemaProperties.size() == strsObjectProperties.size()) {
-                // number of properties are the same but lists still may differ
-                qSort(strsSchemaProperties);
-                qSort(strsObjectProperties);
-                if (!qEqual(strsSchemaProperties.constBegin(), strsSchemaProperties.constEnd(), strsObjectProperties.constBegin())) {
-                    // lists of properties differ - return an additionalProperties error
+            foreach (const Key &key, strsObjectProperties) {
+                if (!m_checks.contains(key)) {
+                    // no additional properties allowed
                     return false;
                 }
             }
-            else {
-                // number of properties differ - return an additionalProperties error
-                return false;
-            }
         }
 
         //qDebug() << Q_FUNC_INFO;