diff --git a/scripts/citation_count_converter.py b/scripts/citation_count_converter.py
index 44ea592..100669d 100644
--- a/scripts/citation_count_converter.py
+++ b/scripts/citation_count_converter.py
@@ -5,6 +5,7 @@
 import io
 from tqdm import tqdm
 import re
+import sys
 
 csv.field_size_limit(sys.maxsize)