--- a/mozilla-tests/config.py
+++ b/mozilla-tests/config.py
@@ -2189,16 +2189,23 @@ for platform in PLATFORMS.keys():
 for platform in PLATFORMS.keys():
     for name, branch in items_at_least(BRANCHES, 'gecko_version', 36):
         for slave_platform in PLATFORMS[platform]['slave_platforms']:
             if platform in BRANCHES[name]['platforms']:
                 if slave_platform in BRANCHES[name]['platforms'][platform]:
                     BRANCHES[name]['platforms'][platform][slave_platform]['opt_unittest_suites'] += MOCHITEST_WEBGL
                     BRANCHES[name]['platforms'][platform][slave_platform]['debug_unittest_suites']+= MOCHITEST_WEBGL
 
+# Enable web-platform-tests-debug on try
+for platform in PLATFORMS.keys():
+    for slave_platform in PLATFORMS[platform]['slave_platforms']:
+        if slave_platform not in BRANCHES['try']['platforms'][platform]:
+            continue
+        BRANCHES['try']['platforms'][platform][slave_platform]['debug_unittest_suites'] += WEB_PLATFORM_TESTS_CHUNKED_MORE[:] + WEB_PLATFORM_REFTESTS
+
 # Enable web-platform-tests on cedar
 for platform in PLATFORMS.keys():
     if platform not in BRANCHES['cedar']['platforms']:
         continue
 
     for slave_platform in PLATFORMS[platform]['slave_platforms']:
         if slave_platform not in BRANCHES['cedar']['platforms'][platform]:
             continue