diff --git a/third_party/re2/util/util.h b/third_party/re2/util/util.h
index 8f54040..de1ef5b 100644
--- a/third_party/re2/util/util.h
+++ b/third_party/re2/util/util.h
@@ -46,7 +46,8 @@ using std::sort;
 using std::swap;
 using std::make_pair;
 
-#if defined(__GNUC__) && !defined(USE_CXX0X) && !defined(OS_ANDROID)
+#if defined(__GNUC__) && !defined(USE_CXX0X) && !defined(OS_ANDROID) && \
+    !defined(_LIBCPP_ABI_VERSION)
 
 #include <tr1/unordered_set>
 using std::tr1::unordered_set;