diff --git a/security/manager/ssl/tests/unit/xpcshell.ini b/security/manager/ssl/tests/unit/xpcshell.ini
index 220ffc840d71..c35a81b70376 100644
--- a/security/manager/ssl/tests/unit/xpcshell.ini
+++ b/security/manager/ssl/tests/unit/xpcshell.ini
@@ -75,7 +75,7 @@ run-sequentially = hardcoded ports
 [test_cert_embedded_null.js]
 [test_cert_ipv6_san.js]
 [test_cert_expiration_canary.js]
-run-if = nightly_build
+skip-if = true # bug 1686615
 [test_cert_keyUsage.js]
 [test_cert_isBuiltInRoot.js]
 [test_cert_isBuiltInRoot_reload.js]