diff --git a/JSONObject.java b/JSONObject.java
index 14f58b8..682c513 100755
--- a/JSONObject.java
+++ b/JSONObject.java
@@ -1633,7 +1633,8 @@ public class JSONObject {
                     || object instanceof Short || object instanceof Integer
                     || object instanceof Long || object instanceof Boolean
                     || object instanceof Float || object instanceof Double
-                    || object instanceof String) {
+                    || object instanceof String || object instanceof BigInteger
+                    || object instanceof BigDecimal) {
                 return object;
             }