diff --git a/src/Binder/Binder.cpp b/src/Binder/Binder.cpp
index 504073d..c770c5b 100644
--- a/src/Binder/Binder.cpp
+++ b/src/Binder/Binder.cpp
@@ -406,7 +406,7 @@ namespace Porygon::Binder {
         if (scope == -1) {
             this->_scriptData->Diagnostics->LogError(Diagnostics::DiagnosticCode::VariableNotFound,
                                                      expression->GetStartPosition(),
-                                                     expression->GetLength());
+                                                     expression->GetLength(), {key.GetDebugString()});
             return new BoundBadExpression(expression->GetStartPosition(), expression->GetLength());
         }
         auto var = this->_scope->GetVariable(scope, key);
diff --git a/src/Diagnostics/ErrorMessages-EN-US.cpp b/src/Diagnostics/ErrorMessages-EN-US.cpp
index 40b00ee..d550712 100644
--- a/src/Diagnostics/ErrorMessages-EN-US.cpp
+++ b/src/Diagnostics/ErrorMessages-EN-US.cpp
@@ -11,7 +11,7 @@ namespace Porygon::Diagnostics {
             {DiagnosticCode ::NoBinaryOperationFound, "No binary operation found for these operands and operator."},
             {DiagnosticCode ::NoUnaryOperationFound, "No unary operation found for this operand and operator."},
             {DiagnosticCode ::CantAssignVariable, "Something went wrong while assigning variable."},
-            {DiagnosticCode ::VariableNotFound, "Variable not found."},
+            {DiagnosticCode ::VariableNotFound, "Variable '{0}' not found."},
             {DiagnosticCode ::ExpressionIsNotAFunction, "Called expression is not a function."},
             {DiagnosticCode ::CantIndex, "Unable to index type {0} with {1}."},
             {DiagnosticCode ::InvalidReturnType, "Invalid return type."},