diff --git a/websocketd_server.py b/websocketd_server.py
index 1748f01be89ad112246d44ae604abb1b22ecef19..5ff5e32093c84a8ccc0d34ae484760c99667b5b8 100644
--- a/websocketd_server.py
+++ b/websocketd_server.py
@@ -5,7 +5,7 @@ import sys
 
 def main():
 	output_file = sys.argv[1]
-	print("Saving output to %" % output_file)
+	print("Saving output to %s" % output_file)
 	for line in sys.stdin:
 		entry = line.strip() + ',' + datetime.datetime.now().isoformat()
 		with open(output_file, 'a') as f: