diff --git a/src/Binder/BoundVariables/BoundVariableKey.hpp b/src/Binder/BoundVariables/BoundVariableKey.hpp
index 67edc2b..022bebe 100644
--- a/src/Binder/BoundVariables/BoundVariableKey.hpp
+++ b/src/Binder/BoundVariables/BoundVariableKey.hpp
@@ -10,11 +10,11 @@ class BoundVariableKey{
     int _identifier;
     unsigned int _scopeId;
     bool _isCreation;
-    u_int64_t _hash;
+    uint64_t _hash;
 
-    static u_int64_t KnuthsHash(int i1, int i2)
+    static uint64_t KnuthsHash(int i1, int i2)
     {
-        u_int64_t ret = i1;
+        uint64_t ret = i1;
         ret *= 2654435761U;
         return ret ^ i2;
     }
@@ -39,7 +39,7 @@ public:
         return _isCreation;
     }
 
-    u_int64_t GetHash(){
+    uint64_t GetHash(){
         return _hash;
     }
 };
diff --git a/src/Evaluator/EvaluationScope/EvaluationScope.cpp b/src/Evaluator/EvaluationScope/EvaluationScope.cpp
index f74d492..cc0a873 100644
--- a/src/Evaluator/EvaluationScope/EvaluationScope.cpp
+++ b/src/Evaluator/EvaluationScope/EvaluationScope.cpp
@@ -4,7 +4,7 @@
 
 EvaluationScope::EvaluationScope(unordered_map<size_t, shared_ptr<EvalValue>> *scriptVariables, int deepestScope) {
     _scriptScope = scriptVariables;
-    _localScope = unordered_map<u_int64_t, shared_ptr<EvalValue>>(deepestScope);
+    _localScope = unordered_map<uint64_t, shared_ptr<EvalValue>>(deepestScope);
 }
 
 void EvaluationScope::CreateVariable(BoundVariableKey* key, const shared_ptr<EvalValue> &value) {
diff --git a/src/Evaluator/EvaluationScope/EvaluationScope.hpp b/src/Evaluator/EvaluationScope/EvaluationScope.hpp
index 0d3ad64..ecd0f6a 100644
--- a/src/Evaluator/EvaluationScope/EvaluationScope.hpp
+++ b/src/Evaluator/EvaluationScope/EvaluationScope.hpp
@@ -8,7 +8,7 @@
 
 class EvaluationScope {
     unordered_map<size_t, shared_ptr<EvalValue>>* _scriptScope;
-    unordered_map<u_int64_t, shared_ptr<EvalValue>> _localScope;
+    unordered_map<uint64_t, shared_ptr<EvalValue>> _localScope;
 public:
     explicit EvaluationScope(unordered_map<size_t, shared_ptr<EvalValue>>* scriptVariables, int deepestScope);
     ~EvaluationScope() = default;