diff --git a/include/contractor/contractor_heap.hpp b/include/contractor/contractor_heap.hpp
index fc581f3b0..77a0a85af 100644
--- a/include/contractor/contractor_heap.hpp
+++ b/include/contractor/contractor_heap.hpp
@@ -20,7 +20,8 @@ using ContractorHeap = util::QueryHeap<NodeID,
                                        NodeID,
                                        EdgeWeight,
                                        ContractorHeapData,
-                                       util::XORFastHashStorage<NodeID, NodeID>>;
+                                       util::XORFastHashStorage<NodeID, NodeID>,
+                                       false>;
 
 } // namespace osrm::contractor
 
diff --git a/include/util/pool_allocator.hpp b/include/util/pool_allocator.hpp
index 7d6e03714..9789e26e1 100644
--- a/include/util/pool_allocator.hpp
+++ b/include/util/pool_allocator.hpp
@@ -23,13 +23,12 @@ class MemoryManager
 public:
     static MemoryManager &instance()
     {
-        thread_local MemoryManager instance;
+        static thread_local MemoryManager instance;
         return instance;
     }
 
     T *allocate(std::size_t n)
     {
-        std::lock_guard<std::mutex> lock(mutex_);
         size_t free_list_index = get_next_power_of_two_exponent(n);
         auto &free_list = free_lists_[free_list_index];
         const auto items_in_block = 1u << free_list_index;
@@ -52,7 +51,6 @@ public:
 
     void deallocate(T *p, std::size_t n) noexcept
     {
-        std::lock_guard<std::mutex> lock(mutex_);
         size_t free_list_index = get_next_power_of_two_exponent(n);
         free_lists_[free_list_index].push_back(p);
     }
@@ -66,8 +64,6 @@ public:
     }
 
 private:
-    std::mutex mutex_;
-
     MemoryManager() = default;
     MemoryManager(const MemoryManager &) = delete;
     MemoryManager &operator=(const MemoryManager &) = delete;