diff --git a/pkg/vm/vm.go b/pkg/vm/vm.go
index 6b838752f..ca68a2716 100644
--- a/pkg/vm/vm.go
+++ b/pkg/vm/vm.go
@@ -659,7 +659,7 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
 			panic("invalid destination index")
 		}
 		dst := v.estack.Pop().value.(*stackitem.Buffer).Value().([]byte)
-		if sum := si + n; sum < 0 || sum > len(dst) {
+		if sum := di + n; sum < 0 || sum > len(dst) {
 			panic("size is too big")
 		}
 		copy(dst[di:], src[si:si+n])
diff --git a/pkg/vm/vm_test.go b/pkg/vm/vm_test.go
index 24e0a3150..65c51e2d4 100644
--- a/pkg/vm/vm_test.go
+++ b/pkg/vm/vm_test.go
@@ -1344,6 +1344,10 @@ func TestMEMCPY(t *testing.T) {
 		buf := stackitem.NewBuffer([]byte{0, 1, 2, 3})
 		runWithArgs(t, prog, stackitem.NewBuffer([]byte{0, 6, 7, 3}), buf, buf, 1, []byte{4, 5, 6, 7}, 2, 2)
 	})
+	t.Run("NonZeroDstIndex", func(t *testing.T) {
+		buf := stackitem.NewBuffer([]byte{0, 1, 2})
+		runWithArgs(t, prog, stackitem.NewBuffer([]byte{0, 6, 7}), buf, buf, 1, []byte{4, 5, 6, 7}, 2, 2)
+	})
 	t.Run("NegativeSize", getTestFuncForVM(prog, nil, stackitem.NewBuffer([]byte{0, 1}), 0, []byte{2}, 0, -1))
 	t.Run("NegativeSrcIndex", getTestFuncForVM(prog, nil, stackitem.NewBuffer([]byte{0, 1}), 0, []byte{2}, -1, 1))
 	t.Run("NegativeDstIndex", getTestFuncForVM(prog, nil, stackitem.NewBuffer([]byte{0, 1}), -1, []byte{2}, 0, 1))