1diff --git a/re2/re2.cc b/re2/re2.cc
2index b9e44fc..fb43abf 100644
3--- a/re2/re2.cc
4+++ b/re2/re2.cc
5@@ -56,8 +56,8 @@ RE2::Options::Options()
6 
7 RE2::Options::Options(RE2::CannedOptions opt)
8   : encoding_(opt == RE2::Latin1 ? EncodingLatin1 : EncodingUTF8),
9-    posix_syntax_(opt == RE2::POSIX),
10-    longest_match_(opt == RE2::POSIX),
11+    posix_syntax_(opt == RE2::POSIX_SYNTAX),
12+    longest_match_(opt == RE2::POSIX_SYNTAX),
13     log_errors_(opt != RE2::Quiet),
14     max_mem_(kDefaultMaxMem),
15     literal_(false),
16diff --git a/re2/re2.h b/re2/re2.h
17index c509853..98b06b8 100644
18--- a/re2/re2.h
19+++ b/re2/re2.h
20@@ -251,7 +251,7 @@ class RE2 {
21   enum CannedOptions {
22     DefaultOptions = 0,
23     Latin1, // treat input as Latin-1 (default UTF-8)
24-    POSIX, // POSIX syntax, leftmost-longest match
25+    POSIX_SYNTAX, // POSIX syntax, leftmost-longest match
26     Quiet // do not log about regexp parse errors
27   };
28 
29