diff --git a/channels/handler.py b/channels/handler.py
index e6d5734..f43da22 100644
--- a/channels/handler.py
+++ b/channels/handler.py
@@ -44,7 +44,7 @@ class AsgiRequest(http.HttpRequest):
         # Path info
         self.path = self.message['path']
         self.script_name = self.message.get('root_path', '')
-        if self.script_name:
+        if self.script_name and self.path.startswith(self.script_name):
             # TODO: Better is-prefix checking, slash handling?
             self.path_info = self.path[len(self.script_name):]
         else:
diff --git a/channels/management/commands/runserver.py b/channels/management/commands/runserver.py
index ac1d783..062ac46 100644
--- a/channels/management/commands/runserver.py
+++ b/channels/management/commands/runserver.py
@@ -84,6 +84,7 @@ class Command(RunserverCommand):
                 action_logger=self.log_action,
                 http_timeout=self.http_timeout,
                 ws_protocols=getattr(settings, 'CHANNELS_WS_PROTOCOLS', None),
+                root_path=getattr(settings, 'FORCE_SCRIPT_NAME', ''),
             ).run()
             self.logger.debug("Daphne exited")
         except KeyboardInterrupt:
diff --git a/channels/tests/test_management.py b/channels/tests/test_management.py
index 6c3f78e..6213caa 100644
--- a/channels/tests/test_management.py
+++ b/channels/tests/test_management.py
@@ -87,7 +87,7 @@ class RunServerTests(TestCase):
         call_command('runserver', '--noreload')
         mocked_server.assert_called_with(port=8000, signal_handlers=True, http_timeout=60,
                                          host='127.0.0.1', action_logger=mock.ANY, channel_layer=mock.ANY,
-                                         ws_protocols=None)
+                                         ws_protocols=None, root_path=None)
 
     @mock.patch('channels.management.commands.runserver.sys.stdout', new_callable=StringIO)
     @mock.patch('channels.management.commands.runserver.Server')
@@ -101,12 +101,12 @@ class RunServerTests(TestCase):
             call_command('runserver', '--noreload')
             mocked_server.assert_called_with(port=8000, signal_handlers=True, http_timeout=60,
                                              host='127.0.0.1', action_logger=mock.ANY, channel_layer=mock.ANY,
-                                             ws_protocols=None)
+                                             ws_protocols=None, root_path=None)
 
             call_command('runserver', '--noreload', 'localhost:8001')
             mocked_server.assert_called_with(port=8001, signal_handlers=True, http_timeout=60,
                                              host='localhost', action_logger=mock.ANY, channel_layer=mock.ANY,
-                                             ws_protocols=None)
+                                             ws_protocols=None, root_path=None)
 
         self.assertFalse(mocked_worker.called,
                          "The worker should not be called with '--noworker'")
@@ -121,7 +121,7 @@ class RunServerTests(TestCase):
         call_command('runserver', '--noreload', '--noworker')
         mocked_server.assert_called_with(port=8000, signal_handlers=True, http_timeout=60,
                                          host='127.0.0.1', action_logger=mock.ANY, channel_layer=mock.ANY,
-                                         ws_protocols=None)
+                                         ws_protocols=None, root_path=None)
         self.assertFalse(mocked_worker.called,
                          "The worker should not be called with '--noworker'")