diff --git a/build.sh b/build.sh
index ec7fc3a..6982c3e 100755
--- a/build.sh
+++ b/build.sh
@@ -6,6 +6,7 @@ template () {
 	echo "<meta name=viewport content='width=device-width, initial-scale=1.0'>"
 	echo "<link rel=stylesheet href=drip.css>"
 	echo "<title>$1</title>"
+	: "${inicio:=}"
 	if test "$inicio" != true; then
 		echo "<a href=.>☚ Volver al inicio</a>"
 	fi