diff --git a/src/ddo/DDO.ts b/src/ddo/DDO.ts
index 8798e33..71af9b1 100644
--- a/src/ddo/DDO.ts
+++ b/src/ddo/DDO.ts
@@ -102,7 +102,7 @@ export class DDO {
             this.id,
         ]
 
-        return Web3Provider.getWeb3().utils.sha3(values.join("")).replace(/^0x([a-f0-9]{64})(:!.+)?$/i, "$1")
+        return Web3Provider.getWeb3().utils.sha3(values.join("")).replace(/^0x([a-f0-9]{64})(:!.+)?$/i, "0x$1")
     }
 
     /**
diff --git a/test/ddo/DDO.test.ts b/test/ddo/DDO.test.ts
index 6928391..6afdef6 100644
--- a/test/ddo/DDO.test.ts
+++ b/test/ddo/DDO.test.ts
@@ -238,7 +238,7 @@ describe("DDO", () => {
             const ddo = new DDO(testDDO)
             const checksum = ddo.getChecksum()
 
-            assert.equal(checksum, "15f27a7a3c7b15d2b06dec7347c6b8da168adddd7df51a8ebbbe87b59b80049b")
+            assert.equal(checksum, "0x15f27a7a3c7b15d2b06dec7347c6b8da168adddd7df51a8ebbbe87b59b80049b")
         })
     })