diff --git a/gen/decoder.go b/gen/decoder.go
index 424195d..21fea2f 100644
--- a/gen/decoder.go
+++ b/gen/decoder.go
@@ -124,7 +124,6 @@ func (g *Generator) genTypeDecoderNoCheck(t reflect.Type, out string, tags field
 		}
 
 	case reflect.Array:
-		tmpVar := g.uniqueVarName()
 		iterVar := g.uniqueVarName()
 		elem := t.Elem()
 
@@ -145,11 +144,9 @@ func (g *Generator) genTypeDecoderNoCheck(t reflect.Type, out string, tags field
 			fmt.Fprintln(g.out, ws+"  in.Delim('[')")
 			fmt.Fprintln(g.out, ws+"  "+iterVar+" := 0")
 			fmt.Fprintln(g.out, ws+"  for !in.IsDelim(']') && "+iterVar+" < "+fmt.Sprint(length)+" {")
-			fmt.Fprintln(g.out, ws+"    var "+tmpVar+" "+g.getType(elem))
 
-			g.genTypeDecoder(elem, tmpVar, tags, indent+2)
+			g.genTypeDecoder(elem, out+"["+iterVar+"]", tags, indent+2)
 
-			fmt.Fprintln(g.out, ws+"    "+out+"["+iterVar+"] = "+tmpVar)
 			fmt.Fprintln(g.out, ws+"    "+iterVar+"++")
 			fmt.Fprintln(g.out, ws+"    in.WantComma()")
 			fmt.Fprintln(g.out, ws+"  }")
diff --git a/gen/encoder.go b/gen/encoder.go
index 4765317..8775b0c 100644
--- a/gen/encoder.go
+++ b/gen/encoder.go
@@ -140,18 +140,17 @@ func (g *Generator) genTypeEncoderNoCheck(t reflect.Type, in string, tags fieldT
 	case reflect.Array:
 		elem := t.Elem()
 		iVar := g.uniqueVarName()
-		vVar := g.uniqueVarName()
 
 		if t.Elem().Kind() == reflect.Uint8 {
 			fmt.Fprintln(g.out, ws+"out.Base64Bytes("+in+"[:])")
 		} else {
 			fmt.Fprintln(g.out, ws+"out.RawByte('[')")
-			fmt.Fprintln(g.out, ws+"for "+iVar+", "+vVar+" := range "+in+" {")
+			fmt.Fprintln(g.out, ws+"for "+iVar+" := range "+in+" {")
 			fmt.Fprintln(g.out, ws+"  if "+iVar+" > 0 {")
 			fmt.Fprintln(g.out, ws+"    out.RawByte(',')")
 			fmt.Fprintln(g.out, ws+"  }")
 
-			g.genTypeEncoder(elem, vVar, tags, indent+1)
+			g.genTypeEncoder(elem, in+"["+iVar+"]", tags, indent+1)
 
 			fmt.Fprintln(g.out, ws+"}")
 			fmt.Fprintln(g.out, ws+"out.RawByte(']')")