diff --git a/Lib/tokenize.py b/Lib/tokenize.py
index edbaa79..fc1d45b 100644
--- a/Lib/tokenize.py
+++ b/Lib/tokenize.py
@@ -190,4 +190,4 @@
 if __name__ == '__main__':                     # testing
     import sys
     if len(sys.argv) > 1: tokenize(open(sys.argv[1]).readline)
-    else: tokenize(syss.tdin.readline)
+    else: tokenize(sys.stdin.readline)