diff --git a/toolkit/mozapps/update/tests/unit_base_updater/xpcshell.ini b/toolkit/mozapps/update/tests/unit_base_updater/xpcshell.ini
index e4edcdda6c1b..01b4bc210bf0 100644
--- a/toolkit/mozapps/update/tests/unit_base_updater/xpcshell.ini
+++ b/toolkit/mozapps/update/tests/unit_base_updater/xpcshell.ini
@@ -18,8 +18,10 @@ tail =
 [marStageSuccessPartial.js]
 [marVersionDowngrade.js]
 skip-if = os != 'win' && os != 'mac'
+reason = mar signing
 [marWrongChannel.js]
 skip-if = os != 'win' && os != 'mac'
+reason = mar signing
 [marStageFailurePartial.js]
 [marCallbackAppSuccessComplete_win.js]
 skip-if = os != 'win'