diff --git a/domain_tests/aggregate_combinators_test.cc b/domain_tests/aggregate_combinators_test.cc
index 8412ffa9..5ee180d4 100644
--- a/domain_tests/aggregate_combinators_test.cc
+++ b/domain_tests/aggregate_combinators_test.cc
@@ -28,7 +28,6 @@
 #include "absl/random/bit_gen_ref.h"
 #include "absl/random/random.h"
 #include "absl/status/status.h"
-#include "absl/types/optional.h"
 #include "./fuzztest/domain_core.h"
 #include "./domain_tests/domain_testing.h"
 #include "./fuzztest/internal/serialization.h"