diff --git a/services/ticker/README.md b/services/ticker/README.md
index 1b5f945698..566331333c 100644
--- a/services/ticker/README.md
+++ b/services/ticker/README.md
@@ -8,7 +8,7 @@ follow these steps:
 
 1. Install [Docker](https://hub.docker.com/editions/community/docker-ce-desktop-mac)
 2. Clone the [monorepo](https://github.com/stellar/go) and `$ cd services/ticker`
-3. Build the Ticker's docker image: `$ docker build -t ticker`
+3. Build the Ticker's docker image: `$ docker build -t ticker .`
 4. Run the Ticker: `$ docker run --rm -it -p "8000:8000" ticker` (you'll be asked to enter a
    PostgreSQL password)
 5. After the initial setup (after the `supervisord started` message), you should be able to visit