diff --git a/ciphers/uint128_t.hpp b/ciphers/uint128_t.hpp
index c11c881c1..b30ef2429 100644
--- a/ciphers/uint128_t.hpp
+++ b/ciphers/uint128_t.hpp
@@ -85,6 +85,9 @@ class uint128_t {
  public:
     uint128_t() = default;
 
+    template <typename T, typename = typename std::enable_if<
+                              std::is_integral<T>::value, T>::type>
+    explicit uint128_t(T low) : s(low), f(0) {}
     /**
      * @brief Parameterized constructor
      * @param low lower part 8-bit unisgned integer
diff --git a/ciphers/uint256_t.hpp b/ciphers/uint256_t.hpp
index d4afcb6af..6e81af8bd 100644
--- a/ciphers/uint256_t.hpp
+++ b/ciphers/uint256_t.hpp
@@ -65,6 +65,10 @@ class uint256_t {
     // Constructors
     uint256_t() = default;
 
+    template <typename T, typename = typename std::enable_if<
+                              std::is_integral<T>::value, T>::type>
+    explicit uint256_t(T low) : s(low), f(0) {}
+
     /**
      * @brief Parameterized constructor
      * @param low lower part 8-bit unisgned integer