diff --git a/lib/include/srslte/adt/mem_pool.h b/lib/include/srslte/adt/mem_pool.h
index 87066487e..d36acfe8c 100644
--- a/lib/include/srslte/adt/mem_pool.h
+++ b/lib/include/srslte/adt/mem_pool.h
@@ -39,6 +39,7 @@ public:
     // printf("head: %ld\n", (long)head);
     node* next = ::new (block) node(head);
     head       = next;
+    count++;
   }
 
   uint8_t* try_pop() noexcept
@@ -48,11 +49,14 @@ public:
     }
     node* last_head = head;
     head            = head->prev;
+    count--;
     return (uint8_t*)last_head;
   }
 
   bool is_empty() const { return head == nullptr; }
 
+  size_t size() const { return count; }
+
   void clear() { head = nullptr; }
 
 private:
@@ -62,7 +66,8 @@ private:
     explicit node(node* prev_) : prev(prev_) {}
   };
 
-  node* head = nullptr;
+  node*  head  = nullptr;
+  size_t count = 0;
 };
 
 /// memblock stack that mutexes pushing/popping
@@ -130,9 +135,17 @@ public:
     void                       operator()(void* block) { pool->stack.push(static_cast<uint8_t*>(block)); }
     single_thread_obj_pool<T>* pool;
   };
-
   using obj_ptr = std::unique_ptr<T, obj_deleter>;
 
+  ~single_thread_obj_pool()
+  {
+    uint8_t* block = stack.try_pop();
+    while (block != nullptr) {
+      delete[] block;
+      block = stack.try_pop();
+    }
+  }
+
   /// allocate object
   template <typename... Args>
   obj_ptr make(Args&&... args)
@@ -152,6 +165,8 @@ public:
     }
   }
 
+  size_t capacity() const { return stack.size(); }
+
 private:
   memblock_stack stack;
 };
diff --git a/srsenb/src/stack/rrc/rrc.cc b/srsenb/src/stack/rrc/rrc.cc
index a7a69297b..6715e0715 100644
--- a/srsenb/src/stack/rrc/rrc.cc
+++ b/srsenb/src/stack/rrc/rrc.cc
@@ -31,7 +31,7 @@ namespace srsenb {
 rrc::rrc(srslte::task_sched_handle task_sched_) : rrc_log("RRC"), task_sched(task_sched_)
 {
   pending_paging.clear();
-  ue_pool.reserve(10);
+  ue_pool.reserve(16);
 }
 
 rrc::~rrc() {}
@@ -151,7 +151,10 @@ void rrc::add_user(uint16_t rnti, const sched_interface::ue_cfg_t& sched_ue_cfg)
     bool rnti_added = true;
     if (rnti != SRSLTE_MRNTI) {
       // only non-eMBMS RNTIs are present in user map
-      auto p     = users.insert(std::make_pair(rnti, ue_pool.make(this, rnti, sched_ue_cfg)));
+      auto p = users.insert(std::make_pair(rnti, ue_pool.make(this, rnti, sched_ue_cfg)));
+      if (ue_pool.capacity() <= 4) {
+        task_sched.defer_task([this]() { ue_pool.reserve(16); });
+      }
       rnti_added = p.second and p.first->second->is_allocated();
     }
     if (rnti_added) {