diff --git a/ecs/jskult-batch-daily/src/aws/s3.py b/ecs/jskult-batch-daily/src/aws/s3.py
index a4ebc30a..3a5fe240 100644
--- a/ecs/jskult-batch-daily/src/aws/s3.py
+++ b/ecs/jskult-batch-daily/src/aws/s3.py
@@ -1,6 +1,7 @@
+import gzip
 import os
 import os.path as path
-import tarfile
+import shutil
 import tempfile
 
 import boto3
@@ -134,14 +135,14 @@ class VjskReceiveBucket(S3Bucket):
         return temporary_file_path
 
     def unzip_data_file(self, filename: str):
-        ret = []
-        with tarfile.open(filename) as tar:
-            temp_dir = os.path.dirname(filename)
-            tar.extractall(path=temp_dir)
-            extracted_files = tar.getnames()
-            for extracted_file in extracted_files:
-                file = os.path.join(temp_dir, extracted_file)
-                ret.append(file)
+        temp_dir = os.path.dirname(filename)
+        decompress_filename = os.path.basename(filename).replace('.gz', '')
+        decompress_file_path = os.path.join(temp_dir, decompress_filename)
+        with gzip.open(filename, 'rb') as gz:
+            with open(decompress_file_path, 'wb') as decompressed_file:
+                shutil.copyfileobj(gz, decompressed_file)
+
+        ret = [decompress_file_path]
         return ret
 
     def backup_dat_file(self, target_files: list, datetime_key: str):