diff --git a/tests/auto/qgraphicstransform/qgraphicstransform.pro b/tests/auto/qgraphicstransform/qgraphicstransform.pro
index 67c939ed8b..3da3408d29 100644
--- a/tests/auto/qgraphicstransform/qgraphicstransform.pro
+++ b/tests/auto/qgraphicstransform/qgraphicstransform.pro
@@ -1,3 +1,5 @@
 load(qttest_p4)
 SOURCES  += tst_qgraphicstransform.cpp
 CONFIG += parallel_test
+
+linux-*:contains(QT_CONFIG,release):DEFINES+=MAY_HIT_QTBUG_20661
diff --git a/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp b/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp
index 7b928909ff..1a116b7f30 100644
--- a/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp
+++ b/tests/auto/qgraphicstransform/tst_qgraphicstransform.cpp
@@ -359,7 +359,7 @@ void tst_QGraphicsTransform::rotation3dArbitraryAxis()
     exp.rotate(angle, axis);
     QTransform expected = exp.toTransform(1024.0f);
 
-#ifdef Q_OS_LINUX
+#if defined(MAY_HIT_QTBUG_20661)
     // These failures possibly relate to the float vs qreal issue mentioned
     // in the comment above fuzzyCompare().
     if (sizeof(qreal) == sizeof(double)) {