diff --git a/codec_fixed.go b/codec_fixed.go
index 887defd..d6a642b 100644
--- a/codec_fixed.go
+++ b/codec_fixed.go
@@ -115,13 +115,13 @@ type fixedCodec struct {
 }
 
 func (c *fixedCodec) Decode(ptr unsafe.Pointer, r *Reader) {
-	for i := 0; i < c.arrayType.Len(); i++ {
+	for i := range c.arrayType.Len() {
 		c.arrayType.UnsafeSetIndex(ptr, i, reflect2.PtrOf(r.readByte()))
 	}
 }
 
 func (c *fixedCodec) Encode(ptr unsafe.Pointer, w *Writer) {
-	for i := 0; i < c.arrayType.Len(); i++ {
+	for i := range c.arrayType.Len() {
 		bytePtr := c.arrayType.UnsafeGetIndex(ptr, i)
 		w.writeByte(*((*byte)(bytePtr)))
 	}
diff --git a/codec_map.go b/codec_map.go
index ceefa00..18c7de1 100644
--- a/codec_map.go
+++ b/codec_map.go
@@ -67,7 +67,7 @@ func (d *mapDecoder) Decode(ptr unsafe.Pointer, r *Reader) {
 			break
 		}
 
-		for i := int64(0); i < l; i++ {
+		for range l {
 			keyPtr := reflect2.PtrOf(r.ReadString())
 			elemPtr := d.elemType.UnsafeNew()
 			d.decoder.Decode(elemPtr, r)
@@ -115,7 +115,7 @@ func (d *mapDecoderUnmarshaler) Decode(ptr unsafe.Pointer, r *Reader) {
 			break
 		}
 
-		for i := int64(0); i < l; i++ {
+		for range l {
 			keyPtr := d.keyType.UnsafeNew()
 			keyObj := d.keyType.UnsafeIndirect(keyPtr)
 			if reflect2.IsNil(keyObj) {
diff --git a/codec_record.go b/codec_record.go
index d07a4aa..67562b7 100644
--- a/codec_record.go
+++ b/codec_record.go
@@ -465,7 +465,7 @@ func describeStruct(tagKey string, typ reflect2.Type) *structDescriptor {
 			}
 			visited[rtype] = true
 
-			for i := 0; i < f.anon.NumField(); i++ {
+			for i := range f.anon.NumField() {
 				field := f.anon.Field(i).(*reflect2.UnsafeStructField)
 				isUnexported := field.PkgPath() != ""
 
diff --git a/codec_skip.go b/codec_skip.go
index 965efe8..3be0dd6 100644
--- a/codec_skip.go
+++ b/codec_skip.go
@@ -152,7 +152,7 @@ func (d *sliceSkipDecoder) Decode(_ unsafe.Pointer, r *Reader) {
 			continue
 		}
 
-		for i := 0; i < int(l); i++ {
+		for range l {
 			d.decoder.Decode(nil, r)
 		}
 	}
@@ -183,7 +183,7 @@ func (d *mapSkipDecoder) Decode(_ unsafe.Pointer, r *Reader) {
 			continue
 		}
 
-		for i := 0; i < int(l); i++ {
+		for range l {
 			r.SkipString()
 			d.decoder.Decode(nil, r)
 		}
diff --git a/pkg/crc64/crc64.go b/pkg/crc64/crc64.go
index 1506077..889e4b3 100644
--- a/pkg/crc64/crc64.go
+++ b/pkg/crc64/crc64.go
@@ -21,9 +21,9 @@ type Table [256]uint64
 
 func makeTable() *Table {
 	t := new(Table)
-	for i := 0; i < 256; i++ {
+	for i := range 256 {
 		fp := uint64(i)
-		for j := 0; j < 8; j++ {
+		for range 8 {
 			fp = (fp >> 1) ^ (Empty & -(fp & 1))
 		}
 		t[i] = fp
@@ -68,7 +68,7 @@ func (d *digest) Reset() {
 
 // Write accumulatively adds the given data to the checksum.
 func (d *digest) Write(p []byte) (n int, err error) {
-	for i := 0; i < len(p); i++ {
+	for i := range p {
 		d.crc = (d.crc >> 8) ^ d.tab[(int)(byte(d.crc)^p[i])&0xff]
 	}
 
diff --git a/reader_generic.go b/reader_generic.go
index b75d240..32d341c 100644
--- a/reader_generic.go
+++ b/reader_generic.go
@@ -133,7 +133,7 @@ func (r *Reader) ReadArrayCB(fn func(*Reader) bool) {
 		if l == 0 {
 			break
 		}
-		for i := 0; i < int(l); i++ {
+		for range l {
 			fn(r)
 		}
 	}
@@ -147,7 +147,7 @@ func (r *Reader) ReadMapCB(fn func(*Reader, string) bool) {
 			break
 		}
 
-		for i := 0; i < int(l); i++ {
+		for range l {
 			field := r.ReadString()
 			fn(r, field)
 		}
diff --git a/schema.go b/schema.go
index a153768..0d82f7a 100644
--- a/schema.go
+++ b/schema.go
@@ -1735,7 +1735,7 @@ func isValidDefaultBytes(def string) ([]byte, bool) {
 	runes := []rune(def)
 	l := len(runes)
 	b := make([]byte, l)
-	for i := 0; i < l; i++ {
+	for i := range l {
 		if runes[i] < 0 || runes[i] > 255 {
 			return nil, false
 		}