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PiperOrigin-RevId: 933627441
diff --git a/domain_tests/aggregate_combinators_test.cc b/domain_tests/aggregate_combinators_test.cc
index 28eeda4..8412ffa 100644
--- a/domain_tests/aggregate_combinators_test.cc
+++ b/domain_tests/aggregate_combinators_test.cc
@@ -354,7 +354,7 @@
   auto domain = OptionalOf<std::optional<int>>(InRange(1, 3));
   absl::BitGen bitgen;
   std::optional<int> v = Value(domain, bitgen).user_value;
-  EXPECT_THAT(v, AnyOf(absl::nullopt, Optional(_)));
+  EXPECT_THAT(v, AnyOf(std::nullopt, Optional(_)));
 }
 
 TEST(OptionalOf, AlwaysGenerateNulloptWhenPolicySet) {