diff --git a/beacon_node/beacon_chain/tests/tests.rs b/beacon_node/beacon_chain/tests/tests.rs
index 5181f1e76..42b6cb6a2 100644
--- a/beacon_node/beacon_chain/tests/tests.rs
+++ b/beacon_node/beacon_chain/tests/tests.rs
@@ -1,3 +1,5 @@
+#![cfg(not(debug_assertions))]
+
 use beacon_chain::test_utils::{AttestationStrategy, BeaconChainHarness, BlockStrategy};
 use lmd_ghost::ThreadSafeReducedTree;
 use store::MemoryStore;