--- a/taskcluster/taskgraph/test/test_try_option_syntax.py
+++ b/taskcluster/taskgraph/test/test_try_option_syntax.py
@@ -27,17 +27,17 @@ def unittest_task(n, tp):
 def talos_task(n, tp):
     return (n, TestTask('test', n, {
         'talos_try_name': n,
         'test_platform': tp,
     }))
 
 tasks = {k: v for k, v in [
     unittest_task('mochitest-browser-chrome', 'linux'),
-    unittest_task('mochitest-e10s-browser-chrome', 'linux64'),
+    unittest_task('mochitest-browser-chrome-e10s', 'linux64'),
     unittest_task('mochitest-chrome', 'linux'),
     unittest_task('mochitest-webgl', 'linux'),
     unittest_task('crashtest-e10s', 'linux'),
     unittest_task('gtest', 'linux64'),
     talos_task('dromaeojs', 'linux64'),
 ]}
 unittest_tasks = {k: v for k, v in tasks.iteritems()
                   if 'unittest_try_name' in v.attributes}

--- a/taskcluster/taskgraph/try_option_syntax.py
+++ b/taskcluster/taskgraph/try_option_syntax.py
@@ -83,22 +83,22 @@ UNITTEST_ALIASES = {
     'marionette-e10s': alias_prefix('marionette-e10s'),
     'mochitest': alias_prefix('mochitest'),
     'mochitests': alias_prefix('mochitest'),
     'mochitest-e10s': alias_prefix('mochitest-e10s'),
     'mochitests-e10s': alias_prefix('mochitest-e10s'),
     'mochitest-debug': alias_prefix('mochitest-debug-'),
     'mochitest-a11y': alias_contains('mochitest-a11y'),
     'mochitest-bc': alias_prefix('mochitest-browser-chrome'),
-    'mochitest-e10s-bc': alias_prefix('mochitest-e10s-browser-chrome'),
+    'mochitest-e10s-bc': alias_prefix('mochitest-browser-chrome-e10s'),
     'mochitest-browser-chrome': alias_prefix('mochitest-browser-chrome'),
-    'mochitest-e10s-browser-chrome': alias_prefix('mochitest-e10s-browser-chrome'),
+    'mochitest-e10s-browser-chrome': alias_prefix('mochitest-browser-chrome-e10s'),
     'mochitest-chrome': alias_contains('mochitest-chrome'),
     'mochitest-dt': alias_prefix('mochitest-devtools-chrome'),
-    'mochitest-e10s-dt': alias_prefix('mochitest-e10s-devtools-chrome'),
+    'mochitest-e10s-dt': alias_prefix('mochitest-devtools-chrome-e10s'),
     'mochitest-gl': alias_prefix('mochitest-webgl'),
     'mochitest-gl-e10s': alias_prefix('mochitest-webgl-e10s'),
     'mochitest-gpu': alias_prefix('mochitest-gpu'),
     'mochitest-gpu-e10s': alias_prefix('mochitest-gpu-e10s'),
     'mochitest-clipboard': alias_prefix('mochitest-clipboard'),
     'mochitest-clipboard-e10s': alias_prefix('mochitest-clipboard-e10s'),
     'mochitest-jetpack': alias_prefix('mochitest-jetpack'),
     'mochitest-media': alias_prefix('mochitest-media'),