diff --git a/debian/resources/postgres.sh b/debian/resources/postgres.sh
index e20fa33..2dece12 100755
--- a/debian/resources/postgres.sh
+++ b/debian/resources/postgres.sh
@@ -13,7 +13,7 @@ echo "Install PostgreSQL and create the database and users\n"
 #apt-get install -y --force-yes sudo postgresql
 
 #postgres official repository
-echo 'deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main' >> /etc/apt/sources.list.d/pgdg.list
+echo 'deb http://apt.postgresql.org/pub/repos/apt/ jessie-pgdg main' > /etc/apt/sources.list.d/pgdg.list
 wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -
 apt-get update && apt-get upgrade -y
 apt-get install -y --force-yes sudo postgresql