diff --git a/internal/percentage.go b/internal/percentage.go
index a8ef8be..4bc36f5 100644
--- a/internal/percentage.go
+++ b/internal/percentage.go
@@ -3,7 +3,7 @@
 import "math"
 
 // Percentage is a helper function, to calculate percentage.
-func Percentage(total, current int64, width int) float64 {
+func Percentage(total, current int64, width uint) float64 {
 	if total <= 0 {
 		return 0
 	}
@@ -14,6 +14,6 @@
 }
 
 // PercentageRound same as Percentage but with math.Round.
-func PercentageRound(total, current int64, width int) float64 {
+func PercentageRound(total, current int64, width uint) float64 {
 	return math.Round(Percentage(total, current, width))
 }
diff --git a/internal/percentage_test.go b/internal/percentage_test.go
index 6d5410d..515ad60 100644
--- a/internal/percentage_test.go
+++ b/internal/percentage_test.go
@@ -4,7 +4,7 @@
 
 func TestPercentage(t *testing.T) {
 	// key is barWidth
-	testSuite := map[int][]struct {
+	testSuite := map[uint][]struct {
 		name     string
 		total    int64
 		current  int64