Index: ahttp.py
==================================================================
--- ahttp.py
+++ ahttp.py
@@ -73,11 +73,12 @@
     # statusbar info
     if not quieter:
         progress_feedback(url, timeout=timeout/1.5)
     
     # combine headers
-    headers = {}.update(add_headers)
+    headers = {}
+    headers.update(add_headers)
     if ajax:
         headers["X-Requested-With"] = "XMLHttpRequest"
     if referer:
         headers["Referer"] = (referer if referer not in [True, 1] else url)