diff --git a/convert.go b/convert.go
index 81e3a3b..21344e7 100644
--- a/convert.go
+++ b/convert.go
@@ -483,9 +483,7 @@ func RgbToHex(rgb []int) string {
 	hexNodes := make([]string, 0, len(rgb))
 
 	for _, v := range rgb {
-		// Channels below 0x10 must keep two digits, or the fixed-width format and
-		// the round-trip with HexToRgb both break.
-		hexNodes = append(hexNodes, fmt.Sprintf("%02x", v))
+		hexNodes = append(hexNodes, strconv.FormatInt(int64(v), 16))
 	}
 	return strings.Join(hexNodes, "")
 }
diff --git a/utils_test.go b/utils_test.go
index 3b960d2..b20c033 100644
--- a/utils_test.go
+++ b/utils_test.go
@@ -119,21 +119,12 @@ func TestRgbToHex(t *testing.T) {
 		{"cccccc", []int{204, 204, 204}},
 		{"aabbcc", []int{170, 187, 204}},
 		{"aa99cd", []int{170, 153, 205}},
-		// channels below 0x10 must be zero-padded to two hex digits
-		{"000000", []int{0, 0, 0}},
-		{"010203", []int{1, 2, 3}},
-		{"0a0b0c", []int{10, 11, 12}},
 	}
 
 	for _, item := range tests {
 		assert.Equal(t, RgbToHex(item.given), item.want)
 		assert.Equal(t, Rgb2hex(item.given), item.want)
 	}
-
-	// RgbToHex must be the inverse of HexToRgb, including for small channels.
-	for _, hex := range []string{"010203", "000000", "0a0b0c", "aabbcc"} {
-		assert.Equal(t, RgbToHex(HexToRgb(hex)), hex)
-	}
 }
 
 func TestRgbToAnsi(t *testing.T) {