diff --git a/src/valuehash/impl.clj b/src/valuehash/impl.clj
index 42e4888..a8562be 100644
--- a/src/valuehash/impl.clj
+++ b/src/valuehash/impl.clj
@@ -108,4 +108,7 @@
       (map map-entry->byte-array)
       (sort ba-comparator)
       (cons map-sep)
-      (join-byte-arrays))))
+      (join-byte-arrays)))
+  java.math.BigDecimal
+  (to-byte-array [this]
+    (.getBytes (.toString this))))