diff --git a/9.0/entrypoint.sh b/9.0/entrypoint.sh
index 8ec01b4..ce41742 100755
--- a/9.0/entrypoint.sh
+++ b/9.0/entrypoint.sh
@@ -3,10 +3,10 @@
 set -e
 
 # set odoo database host, port, user and password
-: ${PGHOST:=$DB_PORT_5432_TCP_ADDR}
-: ${PGPORT:=$DB_PORT_5432_TCP_PORT}
-: ${PGUSER:=${DB_ENV_POSTGRES_USER:='postgres'}}
-: ${PGPASSWORD:=$DB_ENV_POSTGRES_PASSWORD}
+: ${PGHOST:=${DB_PORT_5432_TCP_ADDR:='db'}}
+: ${PGPORT:=${DB_PORT_5432_TCP_PORT:=5432}}
+: ${PGUSER:=${DB_ENV_POSTGRES_USER:=${POSTGRES_USER:='postgres'}}}
+: ${PGPASSWORD:=${DB_ENV_POSTGRES_PASSWORD:=$POSTGRES_PASSWORD}}
 export PGHOST PGPORT PGUSER PGPASSWORD
 
 case "$1" in