diff --git a/Lib/urlparse.py b/Lib/urlparse.py
index aeed393..22a5fd0 100644
--- a/Lib/urlparse.py
+++ b/Lib/urlparse.py
@@ -28,7 +28,7 @@
 # Characters valid in scheme names
 scheme_chars = string.letters + string.digits + '+-.'
 
-MAX_CACHE_SIZE = 2000
+MAX_CACHE_SIZE = 20
 _parse_cache = {}
 
 def clear_cache():