diff --git a/waternsw_grabber/waternsw_grabber.py b/waternsw_grabber/waternsw_grabber.py
index c135f01..ecc1073 100644
--- a/waternsw_grabber/waternsw_grabber.py
+++ b/waternsw_grabber/waternsw_grabber.py
@@ -307,7 +307,7 @@ def extract_records(input_dir, output_dir):
         ]]
 
         # Get csv name from zip archive
-        csv_name = os.path.join(output_dir, zip_name.replace('.zip', 'csv'))
+        csv_name = os.path.join(output_dir, zip_name.replace('.zip', '.csv'))
 
         # Export to csv
         df.to_csv(csv_name, float_format='%0.3f')