diff --git a/beacon_node/beacon_chain/test_harness/tests/chain.rs b/beacon_node/beacon_chain/test_harness/tests/chain.rs
index e72c3a5aa5..d47de6889a 100644
--- a/beacon_node/beacon_chain/test_harness/tests/chain.rs
+++ b/beacon_node/beacon_chain/test_harness/tests/chain.rs
@@ -1,3 +1,5 @@
+#![cfg(not(debug_assertions))]
+
 use env_logger::{Builder, Env};
 use log::debug;
 use test_harness::BeaconChainHarness;
diff --git a/eth2/fork_choice/tests/tests.rs b/eth2/fork_choice/tests/tests.rs
index 3ce63eeb77..fb530ac434 100644
--- a/eth2/fork_choice/tests/tests.rs
+++ b/eth2/fork_choice/tests/tests.rs
@@ -1,3 +1,4 @@
+#![cfg(not(debug_assertions))]
 // Tests the available fork-choice algorithms
 
 extern crate beacon_chain;
diff --git a/eth2/state_processing/tests/tests.rs b/eth2/state_processing/tests/tests.rs
index 1359508dcd..25613f9a72 100644
--- a/eth2/state_processing/tests/tests.rs
+++ b/eth2/state_processing/tests/tests.rs
@@ -1,6 +1,7 @@
+#![cfg(not(debug_assertions))]
+
 use serde_derive::Deserialize;
 use serde_yaml;
-#[cfg(not(debug_assertions))]
 use state_processing::{
     per_block_processing, per_block_processing_without_verifying_block_signature,
     per_slot_processing,
@@ -63,7 +64,6 @@ fn test_read_yaml() {
 }
 
 #[test]
-#[cfg(not(debug_assertions))]
 fn run_state_transition_tests_small() {
     // Test sanity-check_small-config_32-vals.yaml
     let mut file = {