diff --git a/.travis.yml b/.travis.yml
index 5a213d5..b546795 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: go
-go:       1.11
+go:       1.13
 
 branches:
   only:
diff --git a/defaults.go b/defaults.go
index bdb0e9a..3a825fa 100644
--- a/defaults.go
+++ b/defaults.go
@@ -58,49 +58,49 @@ func setField(field reflect.Value, defaultVal string) error {
 				field.Set(reflect.ValueOf(val).Convert(field.Type()))
 			}
 		case reflect.Int:
-			if val, err := strconv.ParseInt(defaultVal, 10, 64); err == nil {
+			if val, err := strconv.ParseInt(defaultVal, 0, strconv.IntSize); err == nil {
 				field.Set(reflect.ValueOf(int(val)).Convert(field.Type()))
 			}
 		case reflect.Int8:
-			if val, err := strconv.ParseInt(defaultVal, 10, 8); err == nil {
+			if val, err := strconv.ParseInt(defaultVal, 0, 8); err == nil {
 				field.Set(reflect.ValueOf(int8(val)).Convert(field.Type()))
 			}
 		case reflect.Int16:
-			if val, err := strconv.ParseInt(defaultVal, 10, 16); err == nil {
+			if val, err := strconv.ParseInt(defaultVal, 0, 16); err == nil {
 				field.Set(reflect.ValueOf(int16(val)).Convert(field.Type()))
 			}
 		case reflect.Int32:
-			if val, err := strconv.ParseInt(defaultVal, 10, 32); err == nil {
+			if val, err := strconv.ParseInt(defaultVal, 0, 32); err == nil {
 				field.Set(reflect.ValueOf(int32(val)).Convert(field.Type()))
 			}
 		case reflect.Int64:
 			if val, err := time.ParseDuration(defaultVal); err == nil {
 				field.Set(reflect.ValueOf(val).Convert(field.Type()))
-			} else if val, err := strconv.ParseInt(defaultVal, 10, 64); err == nil {
+			} else if val, err := strconv.ParseInt(defaultVal, 0, 64); err == nil {
 				field.Set(reflect.ValueOf(val).Convert(field.Type()))
 			}
 		case reflect.Uint:
-			if val, err := strconv.ParseUint(defaultVal, 10, 64); err == nil {
+			if val, err := strconv.ParseUint(defaultVal, 0, strconv.IntSize); err == nil {
 				field.Set(reflect.ValueOf(uint(val)).Convert(field.Type()))
 			}
 		case reflect.Uint8:
-			if val, err := strconv.ParseUint(defaultVal, 10, 8); err == nil {
+			if val, err := strconv.ParseUint(defaultVal, 0, 8); err == nil {
 				field.Set(reflect.ValueOf(uint8(val)).Convert(field.Type()))
 			}
 		case reflect.Uint16:
-			if val, err := strconv.ParseUint(defaultVal, 10, 16); err == nil {
+			if val, err := strconv.ParseUint(defaultVal, 0, 16); err == nil {
 				field.Set(reflect.ValueOf(uint16(val)).Convert(field.Type()))
 			}
 		case reflect.Uint32:
-			if val, err := strconv.ParseUint(defaultVal, 10, 32); err == nil {
+			if val, err := strconv.ParseUint(defaultVal, 0, 32); err == nil {
 				field.Set(reflect.ValueOf(uint32(val)).Convert(field.Type()))
 			}
 		case reflect.Uint64:
-			if val, err := strconv.ParseUint(defaultVal, 10, 64); err == nil {
+			if val, err := strconv.ParseUint(defaultVal, 0, 64); err == nil {
 				field.Set(reflect.ValueOf(val).Convert(field.Type()))
 			}
 		case reflect.Uintptr:
-			if val, err := strconv.ParseUint(defaultVal, 10, 64); err == nil {
+			if val, err := strconv.ParseUint(defaultVal, 0, strconv.IntSize); err == nil {
 				field.Set(reflect.ValueOf(uintptr(val)).Convert(field.Type()))
 			}
 		case reflect.Float32:
diff --git a/defaults_test.go b/defaults_test.go
index ec20c65..9b4a2d3 100644
--- a/defaults_test.go
+++ b/defaults_test.go
@@ -47,6 +47,39 @@ type Sample struct {
 	String    string        `default:"hello"`
 	Duration  time.Duration `default:"10s"`
 
+	IntOct    int    `default:"0o1"`
+	Int8Oct   int8   `default:"0o10"`
+	Int16Oct  int16  `default:"0o20"`
+	Int32Oct  int32  `default:"0o40"`
+	Int64Oct  int64  `default:"0o100"`
+	UintOct   uint   `default:"0o1"`
+	Uint8Oct  uint8  `default:"0o10"`
+	Uint16Oct uint16 `default:"0o20"`
+	Uint32Oct uint32 `default:"0o40"`
+	Uint64Oct uint64 `default:"0o100"`
+
+	IntHex    int    `default:"0x1"`
+	Int8Hex   int8   `default:"0x8"`
+	Int16Hex  int16  `default:"0x10"`
+	Int32Hex  int32  `default:"0x20"`
+	Int64Hex  int64  `default:"0x40"`
+	UintHex   uint   `default:"0x1"`
+	Uint8Hex  uint8  `default:"0x8"`
+	Uint16Hex uint16 `default:"0x10"`
+	Uint32Hex uint32 `default:"0x20"`
+	Uint64Hex uint64 `default:"0x40"`
+
+	IntBin    int    `default:"0b1"`
+	Int8Bin   int8   `default:"0b1000"`
+	Int16Bin  int16  `default:"0b10000"`
+	Int32Bin  int32  `default:"0b100000"`
+	Int64Bin  int64  `default:"0b1000000"`
+	UintBin   uint   `default:"0b1"`
+	Uint8Bin  uint8  `default:"0b1000"`
+	Uint16Bin uint16 `default:"0b10000"`
+	Uint32Bin uint32 `default:"0b100000"`
+	Uint64Bin uint64 `default:"0b1000000"`
+
 	Struct    Struct         `default:"{}"`
 	StructPtr *Struct        `default:"{}"`
 	Map       map[string]int `default:"{}"`
@@ -182,6 +215,100 @@ func TestInit(t *testing.T) {
 		if sample.String != "hello" {
 			t.Errorf("it should initialize string")
 		}
+
+		if sample.IntOct != 0o1 {
+			t.Errorf("it should initialize int with octal literal")
+		}
+		if sample.Int8Oct != 0o10 {
+			t.Errorf("it should initialize int8 with octal literal")
+		}
+		if sample.Int16Oct != 0o20 {
+			t.Errorf("it should initialize int16 with octal literal")
+		}
+		if sample.Int32Oct != 0o40 {
+			t.Errorf("it should initialize int32 with octal literal")
+		}
+		if sample.Int64Oct != 0o100 {
+			t.Errorf("it should initialize int64 with octal literal")
+		}
+		if sample.UintOct != 0o1 {
+			t.Errorf("it should initialize uint with octal literal")
+		}
+		if sample.Uint8Oct != 0o10 {
+			t.Errorf("it should initialize uint8 with octal literal")
+		}
+		if sample.Uint16Oct != 0o20 {
+			t.Errorf("it should initialize uint16 with octal literal")
+		}
+		if sample.Uint32Oct != 0o40 {
+			t.Errorf("it should initialize uint32 with octal literal")
+		}
+		if sample.Uint64Oct != 0o100 {
+			t.Errorf("it should initialize uint64 with octal literal")
+		}
+
+		if sample.IntHex != 0x1 {
+			t.Errorf("it should initialize int with hexadecimal literal")
+		}
+		if sample.Int8Hex != 0x8 {
+			t.Errorf("it should initialize int8 with hexadecimal literal")
+		}
+		if sample.Int16Hex != 0x10 {
+			t.Errorf("it should initialize int16 with hexadecimal literal")
+		}
+		if sample.Int32Hex != 0x20 {
+			t.Errorf("it should initialize int32 with hexadecimal literal")
+		}
+		if sample.Int64Hex != 0x40 {
+			t.Errorf("it should initialize int64 with hexadecimal literal")
+		}
+		if sample.UintHex != 0x1 {
+			t.Errorf("it should initialize uint with hexadecimal literal")
+		}
+		if sample.Uint8Hex != 0x8 {
+			t.Errorf("it should initialize uint8 with hexadecimal literal")
+		}
+		if sample.Uint16Hex != 0x10 {
+			t.Errorf("it should initialize uint16 with hexadecimal literal")
+		}
+		if sample.Uint32Hex != 0x20 {
+			t.Errorf("it should initialize uint32 with hexadecimal literal")
+		}
+		if sample.Uint64Hex != 0x40 {
+			t.Errorf("it should initialize uint64 with hexadecimal literal")
+		}
+
+		if sample.IntBin != 0b1 {
+			t.Errorf("it should initialize int with binary literal")
+		}
+		if sample.Int8Bin != 0b1000 {
+			t.Errorf("it should initialize int8 with binary literal")
+		}
+		if sample.Int16Bin != 0b10000 {
+			t.Errorf("it should initialize int16 with binary literal")
+		}
+		if sample.Int32Bin != 0b100000 {
+			t.Errorf("it should initialize int32 with binary literal")
+		}
+		if sample.Int64Bin != 0b1000000 {
+			t.Errorf("it should initialize int64 with binary literal")
+		}
+		if sample.UintBin != 0b1 {
+			t.Errorf("it should initialize uint with binary literal")
+		}
+		if sample.Uint8Bin != 0b1000 {
+			t.Errorf("it should initialize uint8 with binary literal")
+		}
+		if sample.Uint16Bin != 0b10000 {
+			t.Errorf("it should initialize uint16 with binary literal")
+		}
+		if sample.Uint32Bin != 0b100000 {
+			t.Errorf("it should initialize uint32 with binary literal")
+		}
+		if sample.Uint64Bin != 0b1000000 {
+			t.Errorf("it should initialize uint64 with binary literal")
+		}
+
 	})
 
 	t.Run("complex types", func(t *testing.T) {
diff --git a/go.mod b/go.mod
index 4f06bae..fae962c 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
 module github.com/creasty/defaults
 
-go 1.11
+go 1.13