diff --git a/beacon_node/beacon_chain/tests/attestation_production.rs b/beacon_node/beacon_chain/tests/attestation_production.rs
index a45389c3c6..c6b116e5ad 100644
--- a/beacon_node/beacon_chain/tests/attestation_production.rs
+++ b/beacon_node/beacon_chain/tests/attestation_production.rs
@@ -1,4 +1,5 @@
-#[cfg(not(debug_assertions))]
+#![cfg(not(debug_assertions))]
+
 use beacon_chain::blob_verification::BlockWrapper;
 use beacon_chain::test_utils::{AttestationStrategy, BeaconChainHarness, BlockStrategy};
 use beacon_chain::{StateSkipConfig, WhenSlotSkipped};