diff --git a/ext/CTParser/CTParser.m b/ext/CTParser/CTParser.m
index 5b3503f..476bf7e 100644
--- a/ext/CTParser/CTParser.m
+++ b/ext/CTParser/CTParser.m
@@ -113,6 +113,7 @@
 
     [environment setObject:@"HTTP/1.1" forKey:@"SERVER_PROTOCOL"];
     [environment setObject:SERVER_SOFTWARE forKey:@"SERVER_SOFTWARE"];
+    [environment setObject:@"" forKey:@"SCRIPT_NAME"];
 
     // We don't do tls yet
     [environment setObject:@"http" forKey:@"rack.url_scheme"];