diff --git a/src/convert-to-parquet/convert-to-parquet.py b/src/convert-to-parquet/convert-to-parquet.py
index f8685de903af374683234b30aebc45812726c350..575b5126238d5db93e167b61d307aab675799015 100755
--- a/src/convert-to-parquet/convert-to-parquet.py
+++ b/src/convert-to-parquet/convert-to-parquet.py
@@ -33,7 +33,7 @@ def parse_line(line):
 
         grp = re.match(r'(?:/data/user(?:/home)?/|/data/project/|/scratch/)([^/]+)',path)
         if grp:
-            tld = grp.groups(1)
+            tld = grp.group(1)
         else:
             tld = None