diff --git a/ethcore/src/snapshot/account.rs b/ethcore/src/snapshot/account.rs
index 23ba31e17..b17c3eb48 100644
--- a/ethcore/src/snapshot/account.rs
+++ b/ethcore/src/snapshot/account.rs
@@ -103,7 +103,8 @@ pub fn to_fat_rlps(account_hash: &H256, acc: &BasicAccount, acct_db: &AccountDB,
 		}
 
 		if let Some(pair) = leftover.take() {
-			account_stream.append_raw_checked(&pair, 1, target_chunk_size);
+			let leftover_appended = account_stream.append_raw_checked(&pair, 1, target_chunk_size);
+			assert!(leftover_appended);
 		}
 
 		loop {