diff --git a/scalar.go b/scalar.go
index 421bfac..0c17cd4 100644
--- a/scalar.go
+++ b/scalar.go
@@ -108,13 +108,13 @@ func ParseValue(v reflect.Value, s string) error {
 		}
 		v.SetBool(x)
 	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
-		x, err := strconv.ParseInt(s, 10, v.Type().Bits())
+		x, err := strconv.ParseInt(s, 0, v.Type().Bits())
 		if err != nil {
 			return err
 		}
 		v.SetInt(x)
 	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
-		x, err := strconv.ParseUint(s, 10, v.Type().Bits())
+		x, err := strconv.ParseUint(s, 0, v.Type().Bits())
 		if err != nil {
 			return err
 		}
diff --git a/scalar_test.go b/scalar_test.go
index 1c51c77..e1fc03d 100644
--- a/scalar_test.go
+++ b/scalar_test.go
@@ -48,6 +48,7 @@ func TestParseValue(t *testing.T) {
 
 	// integers
 	assertParse(t, int(123), "123")
+	assertParse(t, int(123), "1_2_3")
 	assertParse(t, int8(123), "123")
 	assertParse(t, int16(123), "123")
 	assertParse(t, int32(123), "123")
@@ -55,6 +56,7 @@ func TestParseValue(t *testing.T) {
 
 	// unsigned integers
 	assertParse(t, uint(123), "123")
+	assertParse(t, uint(123), "1_2_3")
 	assertParse(t, byte(123), "123")
 	assertParse(t, uint8(123), "123")
 	assertParse(t, uint16(123), "123")