diff --git a/contracts/Requests.sol b/contracts/Requests.sol
index 39ca1d3..90a1ac1 100644
--- a/contracts/Requests.sol
+++ b/contracts/Requests.sol
@@ -23,7 +23,7 @@ struct Ask {
 }
 
 struct Content {
-  string cid; // content id, used to download the dataset
+  bytes cid; // content id, used to download the dataset
   bytes32 merkleRoot; // merkle root of the dataset, used to verify storage proofs
 }
 
diff --git a/test/examples.js b/test/examples.js
index ac88a71..bdb01f5 100644
--- a/test/examples.js
+++ b/test/examples.js
@@ -34,7 +34,7 @@ const exampleRequest = async () => {
       collateral: 200,
     },
     content: {
-      cid: "zb2rhheVmk3bLks5MgzTqyznLu1zqGH5jrfTA1eAZXrjx7Vob",
+      cid: Buffer.from("zb2rhheVmk3bLks5MgzTqyznLu1zqGH5jrfTA1eAZXrjx7Vob"),
       merkleRoot: Array.from(randomBytes(32)),
     },
     expiry: hours(1),
diff --git a/test/ids.js b/test/ids.js
index 5ef1220..0a3e003 100644
--- a/test/ids.js
+++ b/test/ids.js
@@ -22,7 +22,7 @@ function askToArray(ask) {
 }
 
 function contentToArray(content) {
-  return [content.cid, content.merkleRoot]
+  return [content.cid.toString(), content.merkleRoot]
 }
 
 function requestToArray(request) {