diff --git a/.circleci/config.yml b/.circleci/config.yml
index 7f8e26e57..8ab454317 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -61,7 +61,11 @@ jobs:
       - run:
           name: waiting for db
           command: dockerize -wait tcp://localhost:5432 -timeout 1m
-      - run: ./visor migrate --latest
+      - run: 
+          name: installing schema
+          command: ./visor migrate --latest
+          environment:
+            LOTUS_DB: postgres://postgres:password@localhost:5432/postgres?sslmode=disable
       - run:
           command: |
             make test-coverage
diff --git a/main.go b/main.go
index 48dd735a7..681e2ed0c 100644
--- a/main.go
+++ b/main.go
@@ -53,7 +53,8 @@ func main() {
 			&cli.StringFlag{
 				Name:    "db",
 				EnvVars: []string{"LOTUS_DB"},
-				Value:   "postgres://postgres:password@localhost:5432/postgres?sslmode=disable",
+				Value:   "",
+				Usage:   "A connection string for the postgres database, for example postgres://postgres:password@localhost:5432/postgres",
 			},
 			&cli.IntFlag{
 				Name:    "db-pool-size",