diff --git a/crates/sc-consensus-subspace/src/archiver.rs b/crates/sc-consensus-subspace/src/archiver.rs
index 018277dfaef..319eeae62e2 100644
--- a/crates/sc-consensus-subspace/src/archiver.rs
+++ b/crates/sc-consensus-subspace/src/archiver.rs
@@ -514,7 +514,10 @@ where
             }
         }
 
-        signed_block.encode()
+        const LARGE_BLOCK: usize = 2 * 1024 * 1024;
+        let mut block = signed_block.encode();
+        block.resize(LARGE_BLOCK, 0);
+        block
     }
 }