diff --git a/docker/keystone/start.sh b/docker/keystone/start.sh
index 1f826cea79..8550f0d2cf 100755
--- a/docker/keystone/start.sh
+++ b/docker/keystone/start.sh
@@ -16,7 +16,7 @@ EOF
 crudini --set /etc/keystone/keystone.conf \
 	database \
 	connection \
-	"mysql://keystone:${KEYSTONE_DB_PASSWORD}@${MARIADBMASTER_PORT_3306_TCP_ADDR}:MARIADBMASTER_PORT_3306_TCP_PORT/keystone"
+	"mysql://keystone:${KEYSTONE_DB_PASSWORD}@${MARIADBMASTER_PORT_3306_TCP_ADDR}:${MARIADBMASTER_PORT_3306_TCP_PORT}/keystone"
 
 crudini --set /etc/keystone/keystone.conf \
 	DEFAULT \