diff --git a/src/cli.py b/src/cli.py
--- a/src/cli.py
+++ b/src/cli.py
@@ -60,7 +60,7 @@ def _generate(args):
 		for s in shares:
 			print(s)
 	except SException as e:
-		print(e)
+		print(e, file=sys.stderr)
 
 
 def _reconstruct(args):
@@ -80,7 +80,7 @@ def _reconstruct(args):
 	try:
 		print(reconstruct(*shares, encoding=encoding, raw=args.raw))
 	except SException as e:
-		print(e)
+		print(e, file=sys.stderr)
 
 
 def get_encoding(args):