diff --git a/libs/parallel-containers/include/nil/crypto3/container/merkle/proof.hpp b/libs/parallel-containers/include/nil/crypto3/container/merkle/proof.hpp
index 34dad094..9fa25623 100644
--- a/libs/parallel-containers/include/nil/crypto3/container/merkle/proof.hpp
+++ b/libs/parallel-containers/include/nil/crypto3/container/merkle/proof.hpp
@@ -95,7 +95,7 @@ namespace nil {
                     typedef std::array<path_element_type, Arity - 1> layer_type;
                     typedef std::vector<layer_type> path_type;
 
-                    merkle_proof_impl() : _li(0) {};
+                    merkle_proof_impl() : _li(0), _root(value_type()) {};
 
                     merkle_proof_impl(std::size_t li, value_type root, path_type path) : _li(li), _root(root),
                                                                                          _path(path){};
diff --git a/libs/parallel-containers/include/nil/crypto3/container/merkle/tree.hpp b/libs/parallel-containers/include/nil/crypto3/container/merkle/tree.hpp
index ac284a07..1fcf8125 100644
--- a/libs/parallel-containers/include/nil/crypto3/container/merkle/tree.hpp
+++ b/libs/parallel-containers/include/nil/crypto3/container/merkle/tree.hpp
@@ -178,6 +178,7 @@ namespace nil {
 
                     typedef typename node_type::value_type value_type;
                     constexpr static const std::size_t value_bits = node_type::value_bits;
+                    constexpr static const std::size_t arity = Arity;
 
                     typedef std::vector<value_type> container_type;
 
@@ -256,7 +257,7 @@ namespace nil {
                     }
 
                     bool operator==(const merkle_tree_impl &rhs) const {
-                        return _hashes == rhs.val;
+                        return _hashes == rhs._hashes;
                     }
 
                     bool operator!=(const merkle_tree_impl &rhs) const {
@@ -264,7 +265,7 @@ namespace nil {
                     }
 
                     allocator_type get_allocator() const BOOST_NOEXCEPT {
-                        return this->val.__alloc();
+                        return this->_hashes.__alloc();
                     }
 
                     iterator begin() BOOST_NOEXCEPT {