diff --git a/api/chrome/cli.go b/api/chrome/cli.go
index f705de9..64af29a 100644
--- a/api/chrome/cli.go
+++ b/api/chrome/cli.go
@@ -69,12 +69,12 @@ func (c *Cli) OpenTabs() (ret []map[string]string, err error) {
 	return ret, err
 }
 
-func (c *Cli) FindTabByUrl(url string) (ret interface{}, err error) {
+func (c *Cli) FindTabByUrl(url string) (ret string, err error) {
 	err = c.HttpCli().JsonGet("/ipc/chrome/findtabbyurl/"+url, &ret)
 	return ret, err
 }
 
-func (c *Cli) FindTabByTitle(title string) (ret interface{}, err error) {
+func (c *Cli) FindTabByTitle(title string) (ret string, err error) {
 	err = c.HttpCli().JsonGet("/ipc/chrome/findtabbytitle/"+title, &ret)
 	return ret, err
 }