diff --git a/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp b/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp
index 4e17a61821dc..6021afbf6c83 100644
--- a/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp
+++ b/libcxx/test/libcxx/utilities/format/format.arguments/format.arg/arg_t.compile.pass.cpp
@@ -36,3 +36,4 @@ static_assert(uint8_t(std::__format::__arg_t::__long_double) == 11);
 static_assert(uint8_t(std::__format::__arg_t::__const_char_type_ptr) == 12);
 static_assert(uint8_t(std::__format::__arg_t::__string_view) == 13);
 static_assert(uint8_t(std::__format::__arg_t::__ptr) == 14);
+static_assert(uint8_t(std::__format::__arg_t::__handle) == 15);