diff --git a/update.sh b/update.sh
index 8fb4a78..290030f 100755
--- a/update.sh
+++ b/update.sh
@@ -1,5 +1,5 @@
 /usr/local/bin/sbcl --script shinu.lisp
 if [ $? -eq 0 ]; then
   /usr/local/bin/python3 tweet.py
-  mv shinu.png out/`date +"%T"`.png
+  mv shinu.png out/`date`.png
 fi