diff --git a/bin/sign_update b/bin/sign_update
index 7c439990..8fadc4e1 100755
--- a/bin/sign_update
+++ b/bin/sign_update
@@ -6,4 +6,4 @@ if [ "$#" -ne 2 ]; then
   exit 1
 fi
 openssl=/usr/bin/openssl
-$openssl dgst -sha1 -binary < "$1" | $openssl dgst -dss1 -sign "$2" | $openssl enc -base64
+$openssl dgst -sha1 -binary < "$1" | $openssl dgst -sha1 -sign "$2" | $openssl enc -base64