diff --git a/compat.go b/compat.go
new file mode 100644
index 0000000..0031ae4
--- /dev/null
+++ b/compat.go
@@ -0,0 +1,25 @@
+package mastodon
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type ID string
+
+func (id *ID) UnmarshalJSON(data []byte) error {
+	if len(data) > 0 && data[0] == '"' && data[len(data)-1] == '"' {
+		var s string
+		if err := json.Unmarshal(data, &s); err != nil {
+			return err
+		}
+		*id = ID(s)
+		return nil
+	}
+	var n int64
+	if err := json.Unmarshal(data, &n); err != nil {
+		return err
+	}
+	*id = ID(fmt.Sprint(n))
+	return nil
+}