diff --git a/lib/utils.ts b/lib/utils.ts
index 85af30e..4ac1d52 100644
--- a/lib/utils.ts
+++ b/lib/utils.ts
@@ -20,7 +20,7 @@ export namespace bytes {
   }
 
   export function toUnsignedInt(value: Bytes, bigEndian: boolean = true): BigInt {
-    return BigInt.fromUnsignedBytes(bigEndian ? (value.reverse() as Bytes) : value)
+    return BigInt.fromUnsignedBytes(bigEndian ? Bytes.fromUint8Array(value.reverse()) : value)
   }
 
   // Helpers
diff --git a/package.json b/package.json
index 3533cfc..ddf1ca3 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@protofire/subgraph-toolkit",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "AssemblyScript helpers for writing subgraph mappings for The Graph",
   "repository": "https://github.com/protofire/subgraph-toolkit.git",
   "license": "GPL-3.0-only",
@@ -17,4 +17,4 @@
   "peerDependencies": {
     "@graphprotocol/graph-ts": ">=0.20.0"
   }
-}
+}
\ No newline at end of file