diff --git a/go.mod b/go.mod
index d63eade..0e4e469 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module github.com/hellflame/argparse
 
 go 1.16
+
+require golang.org/x/term v0.1.0
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..96fe2b9
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.1.0 h1:g6Z6vPFA9dYBAF7DWcH6sCcOntplXsDKcliusYijMlw=
+golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
diff --git a/utils.go b/utils.go
index da8fc8d..086cde9 100644
--- a/utils.go
+++ b/utils.go
@@ -3,23 +3,15 @@ package argparse
 import (
 	"fmt"
 	"os"
-	"os/exec"
-	"strconv"
 	"strings"
+
+	"golang.org/x/term"
 )
 
 func decideTerminalWidth() int {
-	// decide terminal width
-	cmd := exec.Command("stty", "size")
-	cmd.Stdin = os.Stdin // this is important
-	result, e := cmd.Output()
-	if e != nil {
-		result = []byte("0 80")
-	}
-	width := 80
-	parse := strings.Split(strings.TrimRight(string(result), "\n"), " ")
-	if w, e := strconv.Atoi(parse[1]); e == nil {
-		width = w
+	width, _, err := term.GetSize(int(os.Stdout.Fd()))
+	if err != nil {
+		return 80
 	}
 	return width
 }