diff --git a/winziprint/winziprint.py b/winziprint/winziprint.py
index f9986f9..900316a 100755
--- a/winziprint/winziprint.py
+++ b/winziprint/winziprint.py
@@ -33,7 +33,7 @@ def convert(input_files: list[str], output_files: str, encoding: str = None, pro
                 if progress:
                     print(f'progress: {i + n + i // BATCH_SIZE + 1}/{steps}', flush=True)
             all_pages = [p for doc in documents for p in doc.pages]
-            tmp_file_name = f'{output_files}.part.{i:04}'
+            tmp_file_name = f'{output_files}.{i:04}.part'
             documents[0].copy(all_pages).write_pdf(tmp_file_name)
             tmp_file_names.append(tmp_file_name)
             page_nums += [len(doc.pages) for doc in documents]