diff --git a/crates/pool/src/mempool/uo_pool.rs b/crates/pool/src/mempool/uo_pool.rs
index a98391825..c3e0a18a8 100644
--- a/crates/pool/src/mempool/uo_pool.rs
+++ b/crates/pool/src/mempool/uo_pool.rs
@@ -559,6 +559,7 @@ impl UoPoolMetrics {
 mod tests {
     use std::collections::HashMap;
 
+    use ethers::types::H160;
     use rundler_provider::MockStakeManager;
     use rundler_sim::{
         EntityInfo, EntityInfos, MockPrechecker, MockSimulator, PrecheckError, PrecheckSettings,
@@ -1057,6 +1058,26 @@ mod tests {
         assert_eq!(pool_op, None);
     }
 
+    #[tokio::test]
+    async fn too_many_ops_for_unstaked_sender() {
+        let mut ops = vec![];
+        let addr = H160::random();
+        for i in 0..5 {
+            ops.push(create_op(addr, i, 1))
+        }
+        let pool = create_pool(ops.clone());
+
+        for op in ops.iter().take(4) {
+            pool.add_operation(OperationOrigin::Local, op.op.clone())
+                .await
+                .unwrap();
+        }
+        assert!(pool
+            .add_operation(OperationOrigin::Local, ops[4].op.clone())
+            .await
+            .is_err());
+    }
+
     #[derive(Clone, Debug)]
     struct OpWithErrors {
         op: UserOperation,
@@ -1138,7 +1159,7 @@ mod tests {
             sim_settings: SimulationSettings::default(),
             mempool_channel_configs: HashMap::new(),
             num_shards: 1,
-            same_sender_mempool_count: 16,
+            same_sender_mempool_count: 4,
             throttled_entity_mempool_count: 4,
             throttled_entity_live_blocks: 10,
         };