--- a/taskcluster/taskgraph/try_option_syntax.py
+++ b/taskcluster/taskgraph/try_option_syntax.py
@@ -102,16 +102,18 @@ UNITTEST_ALIASES = {
     'reftest-stylo': alias_matches(r'^(plain-)?reftest-stylo.*$'),
     'reftest-gpu': alias_matches(r'^(plain-)?reftest-gpu.*$'),
     'robocop': alias_prefix('robocop'),
     'web-platform-test': alias_prefix('web-platform-tests'),
     'web-platform-tests': alias_prefix('web-platform-tests'),
     'web-platform-tests-e10s': alias_prefix('web-platform-tests-e10s'),
     'web-platform-tests-reftests': alias_prefix('web-platform-tests-reftests'),
     'web-platform-tests-reftests-e10s': alias_prefix('web-platform-tests-reftests-e10s'),
+    'web-platform-tests-wdspec': alias_prefix('web-platform-tests-wdspec'),
+    'web-platform-tests-wdspec-e10s': alias_prefix('web-platform-tests-wdspec-e10s'),
     'xpcshell': alias_prefix('xpcshell'),
 }
 
 # unittest platforms can be specified by substring of the "pretty name", which
 # is basically the old Buildbot builder name.  This dict has {pretty name,
 # [test_platforms]} translations, This includes only the most commonly-used
 # substrings.  It is OK to add new test platforms to various shorthands here;
 # if you add a new Linux64 test platform for instance, people will expect that