--- a/mozilla-tests/config.py
+++ b/mozilla-tests/config.py
@@ -1946,16 +1946,24 @@ for platform in BRANCHES['holly']['platf
         slave_p['opt_unittest_suites'] = MOCHITEST + REFTEST_ONE_CHUNK + REFTEST_NO_IPC + MOCHITEST_DT
         slave_p['debug_unittest_suites'] = MOCHITEST + REFTEST_ONE_CHUNK + REFTEST_NO_IPC + MOCHITEST_DT_4
 
         # Enable content sandbox tests for Windows bit
         if slave_platform in PLATFORMS['win64']['slave_platforms'] or slave_platform in PLATFORMS['win32']['slave_platforms']:
             slave_p['opt_unittest_suites'] += MOCHITEST_CSB
             slave_p['debug_unittest_suites'] += MOCHITEST_CSB
 
+# Run old-style jetpack tests on try only
+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]['opt_unittest_suites'].append(('jetpack', ['jetpack']))
+        BRANCHES['try']['platforms'][platform][slave_platform]['debug_unittest_suites'].append(('jetpack', ['jetpack']))
+
 # Run mochitest-jetpack tests everywhere except on versioned B2G branches
 # starting from 39.
 for name, branch in items_at_least(BRANCHES, 'gecko_version', 39):
     if name.startswith('mozilla-b2g'):
         continue
     for pf in PLATFORMS:
         if pf not in branch['platforms']:
             continue