diff --git a/print_labels_from_csv.py b/print_labels_from_csv.py
index e3b54dd..2284307 100644
--- a/print_labels_from_csv.py
+++ b/print_labels_from_csv.py
@@ -6,7 +6,7 @@ import os
 medir = os.path.dirname(__file__)
 example_data_path = os.path.join(medir, 'labels.csv')
 
-df = pd.read_csv(example_data_path)
+df = pd.read_csv(example_data_path, converters={i: str for i in range(3)})
 
 printer = ql_wrapper.BrotherQlPrinter(model='QL-800', printer_connection='usb://0x04f9:0x209b')