diff --git a/todoist/common.go b/todoist/common.go
new file mode 100644
index 0000000..842e935
--- /dev/null
+++ b/todoist/common.go
@@ -0,0 +1,25 @@
+package todoist
+
+import "fmt"
+
+type IntBool bool
+
+func (i IntBool) MarshalJSON() ([]byte, error) {
+	if i {
+		return []byte("1"), nil
+	} else {
+		return []byte("0"), nil
+	}
+}
+
+func (i *IntBool) UnmarshalJSON(b []byte) (err error) {
+	switch string(b) {
+	case "1":
+		*i = true
+	case "0":
+		*i = false
+	default:
+		return fmt.Errorf("Could not unmarshal into intbool: %s", string(b))
+	}
+	return nil
+}
diff --git a/todoist/common_test.go b/todoist/common_test.go
new file mode 100644
index 0000000..3f36f41
--- /dev/null
+++ b/todoist/common_test.go
@@ -0,0 +1,27 @@
+package todoist
+
+import "testing"
+
+func TestIntBool_MarshalJSON(t *testing.T) {
+	s := "0"
+	v := IntBool(false)
+	b, err := v.MarshalJSON()
+	if err != nil || string(b) != s {
+		t.Errorf("Expect %s, but got %s", s, string(b))
+	}
+}
+
+func TestIntBool_UnmarshalJSON(t *testing.T) {
+	s := "0"
+	var v IntBool
+	err := v.UnmarshalJSON([]byte(s))
+	if err != nil || v != IntBool(false) {
+		t.Errorf("Expect %s, but got %s", IntBool(false), v)
+	}
+
+	s = "10"
+	err = v.UnmarshalJSON([]byte(s))
+	if err == nil {
+		t.Error("Expect error, but no error")
+	}
+}