diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7372bf738..ae92953c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # Changelog
 
 # Unreleased changes
+ - Fix a bug in the serialization of `AccountIndex`
  - Fix a bug that caused `getAccountInfo` to fail for delegator and baker accounts if they had no stake pending changes. 
    This change is also propagated to the type level such that `Baker` and `AccountDelegation` retains an `Optional<PendingChange>` 
    as opposed to just `PendingChange`.
diff --git a/concordium-sdk/src/main/java/com/concordium/sdk/responses/AccountIndex.java b/concordium-sdk/src/main/java/com/concordium/sdk/responses/AccountIndex.java
index fc186f846..fc446ac60 100644
--- a/concordium-sdk/src/main/java/com/concordium/sdk/responses/AccountIndex.java
+++ b/concordium-sdk/src/main/java/com/concordium/sdk/responses/AccountIndex.java
@@ -38,9 +38,7 @@ public static AccountIndex from(DelegatorId delegatorId) {
     }
 
     public byte[] getBytes() {
-        val buffer = ByteBuffer.allocate(UInt16.BYTES);
-        buffer.put(index.getBytes());
-        return buffer.array();
+        return this.index.getBytes();
     }
 
     @Override