diff --git a/third_party/silentdragonxlite/silentdragonxlite-cli/lib/src/lightwallet.rs b/third_party/silentdragonxlite/silentdragonxlite-cli/lib/src/lightwallet.rs
index 1606e0e..5d99c71 100644
--- a/third_party/silentdragonxlite/silentdragonxlite-cli/lib/src/lightwallet.rs
+++ b/third_party/silentdragonxlite/silentdragonxlite-cli/lib/src/lightwallet.rs
@@ -2237,15 +2237,16 @@ pub fn scan_full_mempool_tx(&self, tx: &Transaction, height: i32, _datetime: u64
             // Prepare the note witnesses for updating
             for tx in txs.values_mut() {
                 for nd in tx.notes.iter_mut() {
-                    // Duplicate the most recent witness
+                    // Duplicate the most recent witness (nothing to do for notes with no history)
                     if let Some(witness) = nd.witnesses.last() {
                         let clone = witness.clone();
                         nd.witnesses.push(clone);
+                        // Trim the oldest witnesses in place (no fresh Vec per note per block)
+                        let len = nd.witnesses.len();
+                        if len > MAX_REORG {
+                            nd.witnesses.drain(..len - MAX_REORG);
+                        }
                     }
-                    // Trim the oldest witnesses
-                    nd.witnesses = nd
-                        .witnesses
-                        .split_off(nd.witnesses.len().saturating_sub(100));
                 }
             }