diff --git a/cmd/zenity/main.go b/cmd/zenity/main.go
index e5b0713..5da225c 100644
--- a/cmd/zenity/main.go
+++ b/cmd/zenity/main.go
@@ -5,8 +5,6 @@ import (
 	"os"
 	"strings"
 
-	"rsc.io/getopt"
-
 	"github.com/ncruces/zenity"
 	"github.com/ncruces/zenity/internal/cmd"
 )
@@ -46,7 +44,7 @@ var (
 
 func main() {
 	setupFlags()
-	getopt.Parse()
+	flag.Parse()
 	validateFlags()
 	opts := loadFlags()
 	cmd.Command = true
diff --git a/go.mod b/go.mod
index baba0a3..b62b7b6 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,3 @@
 module github.com/ncruces/zenity
 
 go 1.13
-
-require rsc.io/getopt v0.0.0-20170811000552-20be20937449
diff --git a/go.sum b/go.sum
index 5894729..e69de29 100644
--- a/go.sum
+++ b/go.sum
@@ -1,2 +0,0 @@
-rsc.io/getopt v0.0.0-20170811000552-20be20937449 h1:UukjJOsjQH0DIuyyrcod6CXHS6cdaMMuJmrt+SN1j4A=
-rsc.io/getopt v0.0.0-20170811000552-20be20937449/go.mod h1:dhCdeqAxkyt5u3/sKRkUXuHaMXUu1Pt13GTQAM2xnig=