diff --git a/main.go b/main.go
index b0e4e19..f82e2dd 100644
--- a/main.go
+++ b/main.go
@@ -206,7 +206,7 @@ func getCACert() (string, error) {
 	path := strings.Join([]string{strings.Trim(cfg.PKIMountPoint, "/"), "cert", "ca"}, "/")
 	cs, err := client.Logical().Read(path)
 	if err != nil {
-		return errors.New("Unable to read certificate: " + err.Error())
+		return "", errors.New("Unable to read certificate: " + err.Error())
 	}
 
 	return cs.Data["certificate"].(string), nil