diff --git a/services/tunnelbroker/src/Constants.h b/services/tunnelbroker/src/Constants.h
--- a/services/tunnelbroker/src/Constants.h
+++ b/services/tunnelbroker/src/Constants.h
@@ -8,6 +8,8 @@
 namespace network {
 
 // AWS DynamoDB
+const size_t DYNAMODB_MAX_BATCH_ITEMS = 25;
+
 const std::string DEVICE_SESSIONS_TABLE_NAME = "tunnelbroker-device-sessions";
 const std::string DEVICE_SESSIONS_VERIFICATION_MESSAGES_TABLE_NAME =
     "tunnelbroker-verification-messages";