diff --git a/ciphers/uint256_t.hpp b/ciphers/uint256_t.hpp
index 3c7b75d25..04d96b574 100644
--- a/ciphers/uint256_t.hpp
+++ b/ciphers/uint256_t.hpp
@@ -197,7 +197,7 @@ class uint256_t {
      * @returns addition of this and p, returning uint256_t integer
      */
     inline uint256_t operator+(const uint256_t &p) {
-        bool app = s + p.s < s;
+        uint32_t app = (s + p.s < s);
         return {f + app + p.f, p.s + s};
     }
 
@@ -210,7 +210,7 @@ class uint256_t {
     template <typename T, typename = typename std::enable_if<
                               std::is_integral<T>::value, T>::type>
     inline uint256_t &operator+=(const T &p) {
-        bool app = p + s < s;
+        uint32_t app = (p + s < s);
         this->f += app;
         this->s += p;
         return *this;
@@ -222,7 +222,7 @@ class uint256_t {
      * @returns addition of this and p, returning this
      */
     inline uint256_t &operator+=(const uint256_t &p) {
-        bool _app = (p.s + s < s);
+        uint32_t _app = (p.s + s < s);
         f += _app + p.f;
         s += p.s;
         return *this;
@@ -255,7 +255,7 @@ class uint256_t {
     template <typename T, typename = typename std::enable_if<
                               std::is_integral<T>::value, T>::type>
     inline uint256_t operator-(const T &p) {
-        bool app = p > s;
+        uint32_t app = (p > s);
         return uint256_t(f - app, s - p);
     }
 
@@ -265,7 +265,7 @@ class uint256_t {
      * @returns subtraction of this and p, returning uint256_t integer
      */
     inline uint256_t operator-(const uint256_t &p) {
-        bool app = p.s > s;
+        uint32_t app = p.s > s;
         return {f - p.f - app, s - p.s};
     }
 
@@ -302,7 +302,7 @@ class uint256_t {
     template <typename T, typename = typename std::enable_if<
                               std::is_integral<T>::value, T>::type>
     inline uint256_t operator-=(const T p) {
-        bool app = p > s;
+        uint32_t app = (p > s);
         f -= app;
         s -= p;
         return *this;
@@ -314,7 +314,7 @@ class uint256_t {
      * @returns subtraction of this and p, returning this
      */
     inline uint256_t &operator-=(const uint256_t &p) {
-        bool app = p.s > s;
+        uint32_t app = p.s > s;
         f = f - app - p.f;
         s -= p.s;
         return *this;