diff --git a/account_statement_base_import/parser/parser.py b/account_statement_base_import/parser/parser.py
index 39d4d313..cda1b539 100644
--- a/account_statement_base_import/parser/parser.py
+++ b/account_statement_base_import/parser/parser.py
@@ -25,7 +25,7 @@ import csv
 def UnicodeDictReader(utf8_data, **kwargs):
     sniffer = csv.Sniffer()
     pos = utf8_data.tell()
-    sample_data = utf8_data.read(1024)
+    sample_data = utf8_data.read(2048)
     utf8_data.seek(pos)
     dialect = sniffer.sniff(sample_data, delimiters=',;\t')
     csv_reader = csv.DictReader(utf8_data, dialect=dialect, **kwargs)