An embarassing litle typo
diff --git a/Lib/test/test_bigmem.py b/Lib/test/test_bigmem.py
index c3b52cd..e915183 100644
--- a/Lib/test/test_bigmem.py
+++ b/Lib/test/test_bigmem.py
@@ -64,7 +64,7 @@
 
 ascii_char_size = 1
 ucs2_char_size = 2
-ucs4_char_size = 2
+ucs4_char_size = 4
 
 
 class BaseStrTest: