diff --git a/re-pcre/re.py b/re-pcre/re.py
index f599f47b..d4dd6d2f 100644
--- a/re-pcre/re.py
+++ b/re-pcre/re.py
@@ -25,6 +25,10 @@ DOTALL = S = 4
 VERBOSE = X = 8
 PCRE_ANCHORED = 0x10
 
+# TODO. Note that Python3 has unicode by default
+ASCII = A = 0
+UNICODE = U = 0
+
 PCRE_INFO_CAPTURECOUNT = 2