diff --git a/channels/handler.py b/channels/handler.py
index 27ff2e4..80faec1 100644
--- a/channels/handler.py
+++ b/channels/handler.py
@@ -50,6 +50,7 @@ class AsgiRequest(http.HttpRequest):
         self.META = {
             "REQUEST_METHOD": self.method,
             "QUERY_STRING": self.message.get('query_string', b'').decode("ascii"),
+            "SCRIPT_NAME": self.script_name.decode("ascii"),
             # Old code will need these for a while
             "wsgi.multithread": True,
             "wsgi.multiprocess": True,