diff --git a/encode_test.go b/encode_test.go
index bbf20470f..51280518e 100644
--- a/encode_test.go
+++ b/encode_test.go
@@ -1240,58 +1240,63 @@ func TestUint64OrInt64ToString(t *testing.T) {
 			name: "normal_map",
 			val: map[string]interface{}{
 				"int":    int(12),
+				"uint":   uint(99),
 				"int64":  int64(34),
 				"uint64": uint64(56),
 			},
-			exceptUint64ToStr:  `{"int":12,"int64":34,"uint64":"56"}`,
-			exceptInt64ToStr:  `{"int":12,"int64":"34","uint64":56}`,
-			exceptFalse: `{"int":12,"int64":34,"uint64":56}`,
+			exceptUint64ToStr:  `{"int":12,"uint":99,"int64":34,"uint64":"56"}`,
+			exceptInt64ToStr:  `{"int":12,"uint":99,"int64":"34","uint64":56}`,
+			exceptFalse: `{"int":12,"uint":99,"int64":34,"uint64":56}`,
 		},
 		{
 			name: "int_key_map",
 			val: map[int64]interface{}{
 				int64(12): int(12),
+				int64(99): uint(99),
 				int64(34): int64(34),
 				int64(56): uint64(56),
 			},
-			exceptUint64ToStr:  `{"12":12,"34":34,"56":"56"}`,
-			exceptInt64ToStr:  `{"12":12,"34":"34","56":56}`,
-			exceptFalse: `{"12":12,"34":34,"56":56}`,
+			exceptUint64ToStr:  `{"12":12,"99":99,"34":34,"56":"56"}`,
+			exceptInt64ToStr:  `{"12":12,"99":99,"34":"34","56":56}`,
+			exceptFalse: `{"12":12,"99":99,"34":34,"56":56}`,
 		},
 		{
 			name: "uint_key_map",
 			val: map[uint64]interface{}{
 				uint64(12): int(12),
+				uint64(99): uint(99),
 				uint64(34): int64(34),
 				uint64(56): uint64(56),
 			},
-			exceptUint64ToStr:  `{"12":12,"34":34,"56":"56"}`,
-			exceptInt64ToStr:  `{"12":12,"34":"34","56":56}`,
-			exceptFalse: `{"12":12,"34":34,"56":56}`,
+			exceptUint64ToStr:  `{"12":12,"99":99,"34":34,"56":"56"}`,
+			exceptInt64ToStr:  `{"12":12,"99":99,"34":"34","56":56}`,
+			exceptFalse: `{"12":12,"99":99,"34":34,"56":56}`,
 		},
 		{
 			name: "normal_struct",
 			val: struct {
 				Int    int    `json:"int"`
+                Uint   uint   `json:"uint"`
 				Int64  int64  `json:"int64"`
 				Uint64 uint64 `json:"uint64"`
 			}{
 				Int:    int(12),
+                Uint:   uint(99),
 				Int64:  int64(34),
 				Uint64: uint64(56),
 			},
-			exceptUint64ToStr:  `{"int":12,"int64":34,"uint64":"56"}`,
-			exceptInt64ToStr:  `{"int":12,"int64":"34","uint64":56}`,
-			exceptFalse: `{"int":12,"int64":34,"uint64":56}`,
+			exceptUint64ToStr:  `{"int":12,"uint":99,"int64":34,"uint64":"56"}`,
+			exceptInt64ToStr:  `{"int":12,"uint":99,"int64":"34","uint64":56}`,
+			exceptFalse: `{"int":12,"uint":99,"int64":34,"uint64":56}`,
 		},
 		{
 			name: "normal_slice",
 			val: []interface{}{
-				int(12), int64(34), uint64(56),
+				int(12), uint(99), int64(34), uint64(56),
 			},
-			exceptUint64ToStr:  `[12,34,"56"]`,
-			exceptInt64ToStr:  `[12,"34",56]`,
-			exceptFalse: `[12,34,56]`,
+			exceptUint64ToStr:  `[12,99,34,"56"]`,
+			exceptInt64ToStr:  `[12,99,"34",56]`,
+			exceptFalse: `[12,99,34,56]`,
 		},
 		{
 			name:        "single_int64",
diff --git a/internal/encoder/vm/vm.go b/internal/encoder/vm/vm.go
index 316c8c0fd..2678b8546 100644
--- a/internal/encoder/vm/vm.go
+++ b/internal/encoder/vm/vm.go
@@ -148,8 +148,8 @@ func Execute(b *[]byte, p unsafe.Pointer, s *vars.Stack, flags uint64, prog *ir.
 				continue
 			}
 			buf = append(buf, '"')
-			v := *(*uint64)(p)
-			buf = alg.U64toa(buf, uint64(v))
+			v := *(*int64)(p)
+			buf = alg.I64toa(buf, int64(v))
 			buf = append(buf, '"')
 		case ir.OP_u8:
 			v := *(*uint8)(p)