--- a/security/manager/ssl/tests/unit/test_sts_parser.js
+++ b/security/manager/ssl/tests/unit/test_sts_parser.js
@@ -29,17 +29,17 @@ function testFailure(header) {
   let dummyUri = Services.io.newURI("https://foo.com/bar.html");
   let maxAge = {};
   let includeSubdomains = {};
 
   throws(() => {
     sss.processHeader(Ci.nsISiteSecurityService.HEADER_HSTS, dummyUri, header,
                       sslStatus, 0, sss.SOURCE_ORGANIC_REQUEST, {}, maxAge,
                       includeSubdomains);
-  }, "Parsed invalid header: " + header);
+  }, /NS_ERROR_FAILURE/, "Parsed invalid header: " + header);
 }
 
 function run_test() {
     // SHOULD SUCCEED:
     testSuccess("max-age=100", 100, false);
     testSuccess("max-age  =100", 100, false);
     testSuccess(" max-age=100", 100, false);
     testSuccess("max-age = 100 ", 100, false);