diff --git a/blsl/ildemux.py b/blsl/ildemux.py
index 684541d..c072280 100644
--- a/blsl/ildemux.py
+++ b/blsl/ildemux.py
@@ -1,5 +1,6 @@
 from io import BytesIO
 from pathlib import Path
+import sys
 from sys import stdin
 from tqdm import tqdm
 from collections import Counter
diff --git a/blsl/nstitch.py b/blsl/nstitch.py
index 02556a6..dddc02a 100644
--- a/blsl/nstitch.py
+++ b/blsl/nstitch.py
@@ -49,4 +49,4 @@ def nstitch_main(argv=None):
     r2.close()
 
 if __name__ == "__main__":
-    nstich_main()
+    nstitch_main()