diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index 17c94e4e9d..f114a84d22 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -2070,6 +2070,7 @@ void QVariant::load(QDataStream &s)
         typeId = QMetaType::type(name.constData());
         if (typeId == QMetaType::UnknownType) {
             s.setStatus(QDataStream::ReadCorruptData);
+            qWarning("QVariant::load: unknown user type with name %s.", name.constData());
             return;
         }
     }