diff --git a/src/Evaluator/EvalValues/EvalValue.hpp b/src/Evaluator/EvalValues/EvalValue.hpp
index 249efe9..4912570 100644
--- a/src/Evaluator/EvalValues/EvalValue.hpp
+++ b/src/Evaluator/EvalValues/EvalValue.hpp
@@ -29,9 +29,7 @@ namespace Porygon::Evaluation {
         virtual bool operator==(const EvalValue *b) const = 0;
 
         [[nodiscard]]
-        virtual bool operator!=(const EvalValue *b) const {
-            return !(this->operator==(b));
-        }
+        virtual bool operator!=(const EvalValue *b) const = 0;
 
         [[nodiscard]]
         virtual EvalValue* Clone() const = 0;
@@ -135,6 +133,10 @@ namespace Porygon::Evaluation {
             return this->EvaluateBool() == b->EvaluateBool();
         };
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]]
         inline std::size_t GetHashCode() const final {
             return _value;
diff --git a/src/Evaluator/EvalValues/NilEvalValue.hpp b/src/Evaluator/EvalValues/NilEvalValue.hpp
index 14ace3e..233ab0f 100644
--- a/src/Evaluator/EvalValues/NilEvalValue.hpp
+++ b/src/Evaluator/EvalValues/NilEvalValue.hpp
@@ -14,6 +14,10 @@ namespace Porygon::Evaluation{
             return b->GetTypeClass() == TypeClass ::Nil;
         }
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]]
         inline EvalValue* Clone() const final{
             return new NilEvalValue();
diff --git a/src/Evaluator/EvalValues/NumericEvalValue.hpp b/src/Evaluator/EvalValues/NumericEvalValue.hpp
index 3cbf698..914abbf 100644
--- a/src/Evaluator/EvalValues/NumericEvalValue.hpp
+++ b/src/Evaluator/EvalValues/NumericEvalValue.hpp
@@ -30,6 +30,10 @@ namespace Porygon::Evaluation {
 
         bool operator==(const EvalValue *b) const final;
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]] EvalValue *Clone() const override;
         [[nodiscard]] size_t GetHashCode() const override;
         [[nodiscard]] EvalValue* Cast(shared_ptr<const ScriptType> castType) const final;
diff --git a/src/Evaluator/EvalValues/NumericalTableEvalValue.hpp b/src/Evaluator/EvalValues/NumericalTableEvalValue.hpp
index f7f9b21..9a5c1db 100644
--- a/src/Evaluator/EvalValues/NumericalTableEvalValue.hpp
+++ b/src/Evaluator/EvalValues/NumericalTableEvalValue.hpp
@@ -38,6 +38,10 @@ namespace Porygon::Evaluation {
             return this->_hash == b->GetHashCode();
         }
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]]
         inline EvalValue* Clone() const final {
             return new NumericalTableEvalValue(_table, _hash);
diff --git a/src/Evaluator/EvalValues/ScriptFunctionEvalValue.hpp b/src/Evaluator/EvalValues/ScriptFunctionEvalValue.hpp
index 26aacbc..79f9ad9 100644
--- a/src/Evaluator/EvalValues/ScriptFunctionEvalValue.hpp
+++ b/src/Evaluator/EvalValues/ScriptFunctionEvalValue.hpp
@@ -82,6 +82,10 @@ namespace Porygon::Evaluation {
             return this->_hash == ((GenericFunctionEvalValue *) b)->_hash;
         };
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         inline std::size_t GetHashCode() const final {
             return _hash;
         }
diff --git a/src/Evaluator/EvalValues/StringEvalValue.hpp b/src/Evaluator/EvalValues/StringEvalValue.hpp
index 41d28ee..5c3ef85 100644
--- a/src/Evaluator/EvalValues/StringEvalValue.hpp
+++ b/src/Evaluator/EvalValues/StringEvalValue.hpp
@@ -32,6 +32,10 @@ namespace Porygon::Evaluation {
             return this->_hash == b->GetHashCode();
         };
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]]
         inline u16string EvaluateString() const final {
             return *_value.get();
diff --git a/src/Evaluator/EvalValues/TableEvalValue.hpp b/src/Evaluator/EvalValues/TableEvalValue.hpp
index 4ec62c8..a663099 100644
--- a/src/Evaluator/EvalValues/TableEvalValue.hpp
+++ b/src/Evaluator/EvalValues/TableEvalValue.hpp
@@ -42,6 +42,10 @@ namespace Porygon::Evaluation {
             return this->_hash == b->GetHashCode();
         }
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]]
         inline EvalValue* Clone() const final {
             return new TableEvalValue(_table, _hash);
diff --git a/src/UserData/UserDataCollections/UserDataCollectionValue.hpp b/src/UserData/UserDataCollections/UserDataCollectionValue.hpp
index 1d382aa..5ec7625 100644
--- a/src/UserData/UserDataCollections/UserDataCollectionValue.hpp
+++ b/src/UserData/UserDataCollections/UserDataCollectionValue.hpp
@@ -60,6 +60,10 @@ namespace Porygon::UserData {
             return b->GetHashCode() == _hash;
         }
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]] EvalValue* Clone() const final{
             return new UserDataCollectionValue(_type, _helper, _hash);
         }
diff --git a/src/UserData/UserDataValue.hpp b/src/UserData/UserDataValue.hpp
index 16219b7..acb276a 100644
--- a/src/UserData/UserDataValue.hpp
+++ b/src/UserData/UserDataValue.hpp
@@ -37,6 +37,10 @@ namespace Porygon::UserData {
             return _obj == ((UserDataValue *) b)->_obj;
         }
 
+        bool operator!=(const EvalValue *b) const override {
+            return !operator==(b);
+        }
+
         [[nodiscard]]
         inline Evaluation::EvalValue* Clone() const final {
             auto ud = _userData->Get();
@@ -78,6 +82,7 @@ namespace Porygon::UserData {
         EvalValue* Cast(shared_ptr<const ScriptType> castType) const final{
             return _userData->Get()->Cast(_obj, castType.get());
         }
+
     };
 }