diff --git a/tests/auto/qfontdialog/qfontdialog.pro b/tests/auto/qfontdialog/qfontdialog.pro
index d4edaaca21..656c4d12f8 100644
--- a/tests/auto/qfontdialog/qfontdialog.pro
+++ b/tests/auto/qfontdialog/qfontdialog.pro
@@ -8,3 +8,5 @@ mac:!qpa {
     OBJECTIVE_SOURCES += tst_qfontdialog_mac_helpers.mm
     LIBS += -framework Cocoa
 }
+
+contains(QT_CONFIG,xcb):qpa:CONFIG+=insignificant_test  # QTBUG-20756 crashes on qpa, xcb