diff --git a/lib/core/include/av-speech-in-noise/core/EyeTrackerCalibration.hpp b/lib/core/include/av-speech-in-noise/core/EyeTrackerCalibration.hpp
index b276d8e4..04b21cd2 100644
--- a/lib/core/include/av-speech-in-noise/core/EyeTrackerCalibration.hpp
+++ b/lib/core/include/av-speech-in-noise/core/EyeTrackerCalibration.hpp
@@ -19,7 +19,7 @@ struct Result {
     Point point{};
 };
 
-void write(std::ostream &, std::vector<Result> &);
+void write(std::ostream &, const std::vector<Result> &);
 
 class Interactor {
   public:
diff --git a/lib/core/src/EyeTrackerCalibration.cpp b/lib/core/src/EyeTrackerCalibration.cpp
index 2860bd8f..482b218a 100644
--- a/lib/core/src/EyeTrackerCalibration.cpp
+++ b/lib/core/src/EyeTrackerCalibration.cpp
@@ -23,7 +23,7 @@ static void write(std::ostream &stream, const std::vector<Point> &v) {
     stream << ']';
 }
 
-void write(std::ostream &stream, std::vector<Result> &v) {
+void write(std::ostream &stream, const std::vector<Result> &v) {
     stream << "Point|Left|Right\n";
     for (const auto &result : v) {
         stream << '[';
diff --git a/macos/main/with-tobii.mm b/macos/main/with-tobii.mm
index c80ac57b..1f0d1bc5 100644
--- a/macos/main/with-tobii.mm
+++ b/macos/main/with-tobii.mm
@@ -424,8 +424,9 @@ static void initialize(TobiiProTracker &tracker,
         validationSubjectPresenter, validationTesterPresenter, validator,
         {{0.5, 0.5}, {0.3F, 0.3F}, {0.3F, 0.7F}, {0.7F, 0.3F}, {0.7F, 0.7F}}};
     static auto calibrator{tracker.calibrator()};
+    static NaiveResultsWriter resultsWriter;
     static InteractorImpl interactor{subjectPresenter, testerPresenter,
-        calibrator,
+        calibrator, resultsWriter,
         {{0.5, 0.5}, {0.1F, 0.1F}, {0.1F, 0.9F}, {0.9F, 0.1F}, {0.9F, 0.9F}}};
     static Controller controller{testerUI, interactor};
     static validation::Controller validationController{