diff --git a/tests/auto/qcompleter/qcompleter.pro b/tests/auto/qcompleter/qcompleter.pro
index cde64ec672..4d58e6b813 100644
--- a/tests/auto/qcompleter/qcompleter.pro
+++ b/tests/auto/qcompleter/qcompleter.pro
@@ -6,4 +6,6 @@ DEPENDPATH += .
 INCLUDEPATH += . ..
 
 # Input
-SOURCES += tst_qcompleter.cpp 
+SOURCES += tst_qcompleter.cpp
+
+CONFIG += insignificant_test # QTBUG-21424
diff --git a/tests/auto/qmenubar/qmenubar.pro b/tests/auto/qmenubar/qmenubar.pro
index 73c2545710..35b7ba8c02 100644
--- a/tests/auto/qmenubar/qmenubar.pro
+++ b/tests/auto/qmenubar/qmenubar.pro
@@ -1,3 +1,5 @@
 load(qttest_p4)
 QT += widgets
 SOURCES += tst_qmenubar.cpp
+
+CONFIG += insignificant_test # QTBUG-21424
diff --git a/tests/auto/qspinbox/qspinbox.pro b/tests/auto/qspinbox/qspinbox.pro
index 56a58dadce..c34378e1fe 100644
--- a/tests/auto/qspinbox/qspinbox.pro
+++ b/tests/auto/qspinbox/qspinbox.pro
@@ -2,5 +2,4 @@ load(qttest_p4)
 QT += widgets
 SOURCES  += tst_qspinbox.cpp
 
-
-
+CONFIG += insignificant_test # QTBUG-21424