diff --git a/core/src/main/java/google/registry/flows/poll/PollRequestFlow.java b/core/src/main/java/google/registry/flows/poll/PollRequestFlow.java
index 92f74399b2e..14a4beb7dea 100644
--- a/core/src/main/java/google/registry/flows/poll/PollRequestFlow.java
+++ b/core/src/main/java/google/registry/flows/poll/PollRequestFlow.java
@@ -32,6 +32,8 @@
 import google.registry.model.poll.MessageQueueInfo;
 import google.registry.model.poll.PollMessage;
 import google.registry.model.poll.PollMessageExternalKeyConverter;
+import google.registry.persistence.IsolationLevel;
+import google.registry.persistence.PersistenceModule.TransactionIsolationLevel;
 import java.util.Optional;
 import javax.inject.Inject;
 import org.joda.time.DateTime;
@@ -47,6 +49,7 @@
  *
  * @error {@link PollRequestFlow.UnexpectedMessageIdException}
  */
+@IsolationLevel(value = TransactionIsolationLevel.TRANSACTION_READ_COMMITTED)
 public final class PollRequestFlow implements TransactionalFlow {
 
   @Inject ExtensionManager extensionManager;