diff --git a/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs b/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs
index ce032b377a3..ecfac461ee3 100644
--- a/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs
+++ b/mithril-test-lab/mithril-end-to-end/src/stress_test/aggregator_helpers.rs
@@ -60,6 +60,14 @@ pub async fn bootstrap_aggregator(
 
     restart_aggregator_and_move_one_epoch_forward(&mut aggregator, current_epoch, args).await?;
 
+    fake_signer::try_register_signer_until_registration_round_is_open(
+        &aggregator,
+        &signers_fixture.signers()[0],
+        *current_epoch + 1,
+        Duration::from_secs(60),
+    )
+    .await?;
+
     info!(">> Send the Signer Key Registrations payloads for the genesis signers");
     let errors = fake_signer::register_signers_to_aggregator(
         &aggregator,
@@ -69,6 +77,14 @@ pub async fn bootstrap_aggregator(
     .await?;
     assert_eq!(0, errors);
 
+    fake_signer::try_register_signer_until_registration_round_is_open(
+        &aggregator,
+        &signers_fixture.signers()[0],
+        *current_epoch + 1,
+        Duration::from_secs(60),
+    )
+    .await?;
+
     restart_aggregator_and_move_one_epoch_forward(&mut aggregator, current_epoch, args).await?;
 
     info!(">> Send the Signer Key Registrations payloads for next genesis signers");