diff -rup a/tests/src/core/testqgsogcutils.cpp b/tests/src/core/testqgsogcutils.cpp
--- a/tests/src/core/testqgsogcutils.cpp	2017-06-18 09:37:34.536042811 +0200
+++ b/tests/src/core/testqgsogcutils.cpp	2017-06-19 16:32:06.405320326 +0200
@@ -32,9 +32,13 @@ class TestQgsOgcUtils : public QObject
 
     void initTestCase()
     {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 6, 0))
+      qSetGlobalQHashSeed(0);
+#else
       // Needed on Qt 5 so that the serialization of XML is consistent among all executions
       extern Q_CORE_EXPORT QBasicAtomicInt qt_qhash_seed;
       qt_qhash_seed.store( 0 );
+#endif
 
       //
       // Runs once before any tests are run