diff --git a/libcxx/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp b/libcxx/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
index 5df6103d79e7a..3c5a57d1c7fec 100644
--- a/libcxx/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
+++ b/libcxx/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
@@ -11,6 +11,7 @@
 #include <bitset>
 #include <algorithm>
 #include <type_traits>
+#include <limits>
 #include <climits>
 #include <cassert>
 #include <stdexcept>