diff --git a/testing/mozharness/configs/android/androidarm.py b/testing/mozharness/configs/android/androidarm.py
index 3e3ff8fa5ec..ce7ac695c84 100644
--- a/testing/mozharness/configs/android/androidarm.py
+++ b/testing/mozharness/configs/android/androidarm.py
@@ -193,6 +193,7 @@ config = {
             "run_filename": "remotexpcshelltests.py",
             "testsdir": "xpcshell",
             "options": [
+                "--dm_trans=sut",
                 "--deviceIP=%(device_ip)s",
                 "--devicePort=%(device_port)s",
                 "--xre-path=%(xre_path)s",
diff --git a/testing/mozharness/configs/android/androidx86.py b/testing/mozharness/configs/android/androidx86.py
index e69fd484d9f..a6f432a541b 100644
--- a/testing/mozharness/configs/android/androidx86.py
+++ b/testing/mozharness/configs/android/androidx86.py
@@ -119,7 +119,8 @@ config = {
         },
         "xpcshell": {
             "run_filename": "remotexpcshelltests.py",
-            "options": ["--deviceIP=%(device_ip)s",
+            "options": ["--dm_trans=sut",
+                        "--deviceIP=%(device_ip)s",
                         "--devicePort=%(device_port)s",
                         "--xre-path=%(xre_path)s",
                         "--testing-modules-dir=%(modules_dir)s",
diff --git a/testing/xpcshell/xpcshellcommandline.py b/testing/xpcshell/xpcshellcommandline.py
index 7152ec9ac52..d9e45106671 100644
--- a/testing/xpcshell/xpcshellcommandline.py
+++ b/testing/xpcshell/xpcshellcommandline.py
@@ -113,8 +113,8 @@ def add_remote_arguments(parser):
                         default=20701, help="port of remote device to test")
 
     parser.add_argument("--dm_trans", action="store", type=str, dest="dm_trans",
-                        choices=["adb", "sut"], default="sut",
-                        help="the transport to use to communicate with device: [adb|sut]; default=sut")
+                        choices=["adb", "sut"], default="adb",
+                        help="the transport to use to communicate with device: [adb|sut]; default=adb")
 
     parser.add_argument("--objdir", action="store", type=str, dest="objdir",
                         help="local objdir, containing xpcshell binaries")