diff --git a/adb/client/commandline.cpp b/adb/client/commandline.cpp
index 936fd5a..3c03eb2 100644
--- a/adb/client/commandline.cpp
+++ b/adb/client/commandline.cpp
@@ -1890,7 +1890,10 @@
     } else if (!strcmp(argv[0], "track-jdwp")) {
         return adb_connect_command("track-jdwp");
     } else if (!strcmp(argv[0], "track-devices")) {
-        return adb_connect_command("host:track-devices");
+        if (argc > 2 || (argc == 2 && strcmp(argv[1], "-l"))) {
+            error_exit("usage: adb track-devices [-l]");
+        }
+        return adb_connect_command(argc == 2 ? "host:track-devices-l" : "host:track-devices");
     } else if (!strcmp(argv[0], "raw")) {
         if (argc != 2) {
             error_exit("usage: adb raw SERVICE");
diff --git a/adb/transport.cpp b/adb/transport.cpp
index 8bc925f..3d1d620 100644
--- a/adb/transport.cpp
+++ b/adb/transport.cpp
@@ -542,9 +542,7 @@
     // for the first time, even if no update occurred.
     if (tracker->update_needed) {
         tracker->update_needed = false;
-
-        std::string transports = list_transports(tracker->long_output);
-        device_tracker_send(tracker, transports);
+        device_tracker_send(tracker, list_transports(tracker->long_output));
     }
 }
 
@@ -587,13 +585,11 @@
     update_transport_status();
 
     // Notify `adb track-devices` clients.
-    std::string transports = list_transports(false);
-
     device_tracker* tracker = device_tracker_list;
     while (tracker != nullptr) {
         device_tracker* next = tracker->next;
         // This may destroy the tracker if the connection is closed.
-        device_tracker_send(tracker, transports);
+        device_tracker_send(tracker, list_transports(tracker->long_output));
         tracker = next;
     }
 }