diff --git a/bin/xss-lock b/bin/xss-lock
index bdaeb5c..6042d64 100755
--- a/bin/xss-lock
+++ b/bin/xss-lock
@@ -2,7 +2,7 @@
 
 me="$(readlink -f "$0")"
 timeout=600
-notify=20
+notify=$((timeout/30))
 display=$(systemd-escape -- "$DISPLAY")
 
 configure() {