diff --git a/owilix/core/duckdb.py b/owilix/core/duckdb.py
index 6cd874a..fdc2948 100644
--- a/owilix/core/duckdb.py
+++ b/owilix/core/duckdb.py
@@ -7,6 +7,7 @@ from dataclasses import dataclass
 from functools import wraps
 from string import Template
 from typing import Dict, Generator, List, Callable, Tuple
+from uuid import uuid4
 
 import duckdb
 from fsspec import AbstractFileSystem
@@ -548,7 +549,6 @@ class OWIDuckDBCopy (OWIDuckDBSelect):
 
             # Parameters for chunk processing
             offset = 0
-            file_counter = 0
             # Determine the total number of rows in owi_slice
             total_rows = self.retry_then_raise(conn, r"SELECT COUNT(*) FROM owi_slice").fetchone()[0]
             _sub_path = pq_batch.query_args.get("sub_path","")
@@ -557,7 +557,7 @@ class OWIDuckDBCopy (OWIDuckDBSelect):
                 # Define the output file path for each chunk
                 output_file_path = os.path.join(self.output_dir,_sub_path)
                 if not os.path.exists(output_file_path): os.makedirs(output_file_path)
-                output_file_path = os.path.join(output_file_path, f"metadata_{file_counter}.parquet")
+                output_file_path = os.path.join(output_file_path, f"metadata_{str(uuid4())}.parquet")
                 # Extract and write the chunk directly to a file, excluding the source_file column
                 copy_query = f"""
                                 COPY (
@@ -571,7 +571,6 @@ class OWIDuckDBCopy (OWIDuckDBSelect):
                 self.retry_then_raise(conn, copy_query)
                 # Increment counters for the next chunk
                 offset += self.chunk_size
-                file_counter += 1
 
             # Final query to count distinct source files and total rows
             count_query = f"""