diff --git a/decode_interface.go b/decode_interface.go
index 455b395..d9fbad7 100644
--- a/decode_interface.go
+++ b/decode_interface.go
@@ -6,8 +6,7 @@ import (
 )
 
 type interfaceDecoder struct {
-	typ   *rtype
-	dummy unsafe.Pointer // for escape value
+	typ *rtype
 }
 
 func newInterfaceDecoder(typ *rtype) *interfaceDecoder {
@@ -40,7 +39,6 @@ func (d *interfaceDecoder) decodeStream(s *stream, p unsafe.Pointer) error {
 		case '{':
 			var v map[string]interface{}
 			ptr := unsafe.Pointer(&v)
-			d.dummy = ptr
 			if err := newMapDecoder(
 				interfaceMapType,
 				newStringDecoder(),
@@ -53,7 +51,6 @@ func (d *interfaceDecoder) decodeStream(s *stream, p unsafe.Pointer) error {
 		case '[':
 			var v []interface{}
 			ptr := unsafe.Pointer(&v)
-			d.dummy = ptr // escape ptr
 			if err := newSliceDecoder(
 				newInterfaceDecoder(d.typ),
 				d.typ,
@@ -122,7 +119,6 @@ func (d *interfaceDecoder) decode(buf []byte, cursor int64, p unsafe.Pointer) (i
 	case '{':
 		var v map[string]interface{}
 		ptr := unsafe.Pointer(&v)
-		d.dummy = ptr
 		dec := newMapDecoder(
 			interfaceMapType,
 			newStringDecoder(),
@@ -137,7 +133,6 @@ func (d *interfaceDecoder) decode(buf []byte, cursor int64, p unsafe.Pointer) (i
 	case '[':
 		var v []interface{}
 		ptr := unsafe.Pointer(&v)
-		d.dummy = ptr // escape ptr
 		dec := newSliceDecoder(
 			newInterfaceDecoder(d.typ),
 			d.typ,
diff --git a/decode_map.go b/decode_map.go
index ed8a442..097805b 100644
--- a/decode_map.go
+++ b/decode_map.go
@@ -8,7 +8,6 @@ type mapDecoder struct {
 	mapType      *rtype
 	keyDecoder   decoder
 	valueDecoder decoder
-	dummy        *interfaceHeader
 }
 
 func newMapDecoder(mapType *rtype, keyDec decoder, valueDec decoder) *mapDecoder {
@@ -28,25 +27,21 @@ func mapassign(t *rtype, m unsafe.Pointer, key, val unsafe.Pointer)
 
 func (d *mapDecoder) setKey(buf []byte, cursor int64, key interface{}) (int64, error) {
 	header := (*interfaceHeader)(unsafe.Pointer(&key))
-	d.dummy = header
 	return d.keyDecoder.decode(buf, cursor, header.ptr)
 }
 
 func (d *mapDecoder) setValue(buf []byte, cursor int64, key interface{}) (int64, error) {
 	header := (*interfaceHeader)(unsafe.Pointer(&key))
-	d.dummy = header
 	return d.valueDecoder.decode(buf, cursor, header.ptr)
 }
 
 func (d *mapDecoder) setKeyStream(s *stream, key interface{}) error {
 	header := (*interfaceHeader)(unsafe.Pointer(&key))
-	d.dummy = header
 	return d.keyDecoder.decodeStream(s, header.ptr)
 }
 
 func (d *mapDecoder) setValueStream(s *stream, key interface{}) error {
 	header := (*interfaceHeader)(unsafe.Pointer(&key))
-	d.dummy = header
 	return d.valueDecoder.decodeStream(s, header.ptr)
 }