diff --git a/client/driver/docker.go b/client/driver/docker.go
index a68b2dff6d1..c50c2b3d8b9 100644
--- a/client/driver/docker.go
+++ b/client/driver/docker.go
@@ -442,7 +442,7 @@ func (d *DockerDriver) Start(ctx *ExecContext, task *structs.Task) (DriverHandle
 			}
 		}
 
-		if authConfig := d.config.Read("docker.auth_config"); authConfig != "" {
+		if authConfig := d.config.Read("docker.auth.config"); authConfig != "" {
 			if f, err := os.Open(authConfig); err == nil {
 				defer f.Close()
 				if authConfigurations, err := docker.NewAuthConfigurations(f); err == nil {
diff --git a/website/source/docs/drivers/docker.html.md b/website/source/docs/drivers/docker.html.md
index dc475e31100..d964a78df23 100644
--- a/website/source/docs/drivers/docker.html.md
+++ b/website/source/docs/drivers/docker.html.md
@@ -247,7 +247,7 @@ The `docker` driver has the following host-level configuration options:
   to customize this if you use a non-standard socket (http or another
   location).
 
-* `docker.auth_config` - Allows an operator to specify a json file which is in
+* `docker.auth.config` - Allows an operator to specify a json file which is in
   the dockercfg format containing authentication information for private registry. 
 
 * `docker.tls.cert` - Path to the server's certificate file (`.pem`). Specify