diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 6eed9a32315..e6934a5972e 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,7 +1,13 @@
+2016-04-20  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/69703
+	* src/c++11/codecvt.cc (__codecvt_utf8_base<char16_t>::do_in,
+	__codecvt_utf8_utf16_base<char16_t>::do_in): Fix mask operations.
+
 2016-04-19  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/69703
-	* src/c++11/codecvt.cc (__codecvt_utf8_base<char16_t>::do_in)):
+	* src/c++11/codecvt.cc (__codecvt_utf8_base<char16_t>::do_in):
 	Override endianness bit in mode.
 	* testsuite/22_locale/codecvt/codecvt_utf8/69703.cc: New test.
 	* testsuite/22_locale/codecvt/codecvt_utf8_utf16/66855.cc: Test
diff --git a/libstdc++-v3/src/c++11/codecvt.cc b/libstdc++-v3/src/c++11/codecvt.cc
index b6b63584fbe..b60691cf2a6 100644
--- a/libstdc++-v3/src/c++11/codecvt.cc
+++ b/libstdc++-v3/src/c++11/codecvt.cc
@@ -789,7 +789,7 @@ do_in(state_type&, const extern_type* __from, const extern_type* __from_end,
 {
   range<const char> from{ __from, __from_end };
   range<char16_t> to{ __to, __to_end };
-  codecvt_mode mode = codecvt_mode(_M_mode | (consume_header|generate_header));
+  codecvt_mode mode = codecvt_mode(_M_mode & (consume_header|generate_header));
 #if __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
   mode = codecvt_mode(mode | little_endian);
 #endif
@@ -1268,7 +1268,7 @@ do_in(state_type&, const extern_type* __from, const extern_type* __from_end,
 {
   range<const char> from{ __from, __from_end };
   range<char16_t> to{ __to, __to_end };
-  codecvt_mode mode = codecvt_mode(_M_mode | (consume_header|generate_header));
+  codecvt_mode mode = codecvt_mode(_M_mode & (consume_header|generate_header));
 #if __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
   mode = codecvt_mode(mode | little_endian);
 #endif