diff --git a/adb/commandline.cpp b/adb/commandline.cpp
index 4e0db2b..7d6de98 100644
--- a/adb/commandline.cpp
+++ b/adb/commandline.cpp
@@ -1200,10 +1200,12 @@
             return 0;
         }
     }
+    else if (!strcmp(argv[0], "tcpip") && argc > 1) {
+        return adb_connect_command(android::base::StringPrintf("tcpip:%s", argv[1]));
+    }
     else if (!strcmp(argv[0], "remount") ||
              !strcmp(argv[0], "reboot") ||
              !strcmp(argv[0], "reboot-bootloader") ||
-             !strcmp(argv[0], "tcpip") ||
              !strcmp(argv[0], "usb") ||
              !strcmp(argv[0], "root") ||
              !strcmp(argv[0], "unroot") ||
diff --git a/adb/services.cpp b/adb/services.cpp
index b9c532a..2e3ad98 100644
--- a/adb/services.cpp
+++ b/adb/services.cpp
@@ -486,7 +486,7 @@
     } else if(!strncmp(name, "tcpip:", 6)) {
         int port;
         if (sscanf(name + 6, "%d", &port) != 1) {
-            port = 0;
+            return -1;
         }
         ret = create_service_thread(restart_tcp_service, (void *) (uintptr_t) port);
     } else if(!strncmp(name, "usb:", 4)) {
diff --git a/adb/tests/test_adb.py b/adb/tests/test_adb.py
index 730f668..3099554 100755
--- a/adb/tests/test_adb.py
+++ b/adb/tests/test_adb.py
@@ -186,7 +186,7 @@
                                                                   remote))
 
     def tcpip(self, port):
-        return call_checked(self.adb_cmd + "tcpip {}".format(port))
+        return call_combined(self.adb_cmd + "tcpip {}".format(port))
 
     def usb(self):
         return call_checked(self.adb_cmd + "usb")
@@ -326,6 +326,16 @@
         else:
             self.assertEqual(output, "Linux\n")
 
+    def test_tcpip(self):
+        """adb tcpip requires a port. http://b/22636927"""
+        output, status_code = AdbWrapper().tcpip("")
+        self.assertEqual(1, status_code)
+        self.assertIn("help message", output)
+
+        output, status_code = AdbWrapper().tcpip("blah")
+        self.assertEqual(1, status_code)
+        self.assertIn("error", output)
+
 
 class AdbFile(unittest.TestCase):
     SCRATCH_DIR = "/data/local/tmp"