diff --git a/src/endpoints/blocks/entities/block.ts b/src/endpoints/blocks/entities/block.ts
index ed5dc51e7..aa6d63076 100644
--- a/src/endpoints/blocks/entities/block.ts
+++ b/src/endpoints/blocks/entities/block.ts
@@ -68,6 +68,9 @@ export class Block {
   @ApiProperty({ type: BlockProofDto, nullable: true, required: false })
   previousHeaderProof: BlockProofDto | undefined = undefined;
 
+  @ApiProperty( { type: String })
+  reserved: string = '';
+
   @ApiProperty({ type: BlockProofDto, nullable: true, required: false })
   proof: BlockProofDto | undefined = undefined;
 
diff --git a/src/test/unit/services/blocks.spec.ts b/src/test/unit/services/blocks.spec.ts
index 5684f66ce..45f364dd6 100644
--- a/src/test/unit/services/blocks.spec.ts
+++ b/src/test/unit/services/blocks.spec.ts
@@ -136,6 +136,7 @@ describe('Block Service', () => {
       gasRefunded: 4932000,
       gasPenalized: 0,
       maxGasLimit: 15000000000,
+      reserved: '',
       scheduledRootHash: undefined,
       proof: undefined,
       previousHeaderProof: new BlockProofDto({