diff --git a/scripts/s3-tests/excluded_tests.txt b/scripts/s3-tests/excluded_tests.txt
index 4a53b66dc..715a841a9 100644
--- a/scripts/s3-tests/excluded_tests.txt
+++ b/scripts/s3-tests/excluded_tests.txt
@@ -9,7 +9,6 @@
 
 # Vendor-specific / non-portable tests
 test_account_usage
-test_atomic_conditional_write_1mb
 test_bucket_get_location
 test_bucket_head_extended
 test_bucket_header_acl_grants
diff --git a/scripts/s3-tests/implemented_tests.txt b/scripts/s3-tests/implemented_tests.txt
index b0350d443..ff3ff5eb4 100644
--- a/scripts/s3-tests/implemented_tests.txt
+++ b/scripts/s3-tests/implemented_tests.txt
@@ -371,6 +371,7 @@ test_list_buckets_invalid_auth
 test_atomic_read_1mb
 test_atomic_read_4mb
 test_atomic_read_8mb
+test_atomic_conditional_write_1mb
 test_atomic_write_1mb
 test_atomic_write_4mb
 test_atomic_write_8mb