diff --git a/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp b/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp
index 7fc28f353..28146a350 100644
--- a/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp
+++ b/Z/src/ngltools/tests/NGLToolsQtSmokeTest.cpp
@@ -11,10 +11,10 @@ private slots:
     void testDTG()
     {
         QDateTime now = QDateTime::currentDateTimeUtc();
-        QString s = NGL::toString(now);
+        QString s = DTG::toString(now);
         QVERIFY(!s.isEmpty());
         bool ok = false;
-        QDateTime parsed = NGL::fromDTGString(s, &ok);
+        QDateTime parsed = DTG::fromDTGString(s, &ok);
         QVERIFY(ok);
         QVERIFY(parsed.isValid());
     }