diff --git a/ydb/tests/library/harness/kikimr_config.py b/ydb/tests/library/harness/kikimr_config.py
index f00c6a80ea00..9976c261804e 100644
--- a/ydb/tests/library/harness/kikimr_config.py
+++ b/ydb/tests/library/harness/kikimr_config.py
@@ -386,8 +386,7 @@ def __init__(
         if default_user_sid:
             self.yaml_config["domains_config"]["security_config"]["default_user_sids"] = [default_user_sid]
 
-        if os.getenv("YDB_HARD_MEMORY_LIMIT_BYTES"):
-            self.yaml_config["memory_controller_config"] = {"hard_limit_bytes": int(os.getenv("YDB_HARD_MEMORY_LIMIT_BYTES"))}
+        self.yaml_config["memory_controller_config"] = {"hard_limit_bytes": 1024 * 1024 * 1024}
 
         if os.getenv("YDB_CHANNEL_BUFFER_SIZE"):
             self.yaml_config["table_service_config"]["resource_manager"]["channel_buffer_size"] = int(os.getenv("YDB_CHANNEL_BUFFER_SIZE"))