diff --git a/arbitrator/prover/src/memory.rs b/arbitrator/prover/src/memory.rs
index 4709c406a7..bba8e4124f 100644
--- a/arbitrator/prover/src/memory.rs
+++ b/arbitrator/prover/src/memory.rs
@@ -263,6 +263,7 @@ impl Memory {
             merkle.set(start_leaf, hash_leaf(self.get_leaf_data(start_leaf)));
             // No need for second merkle
             assert!(value.len() <= Self::LEAF_SIZE);
+            self.merkle = Some(merkle);
         }
 
         true