diff --git a/Machines/Commodore/Plus4/Plus4.cpp b/Machines/Commodore/Plus4/Plus4.cpp
index 21d403756..7349a2d3c 100644
--- a/Machines/Commodore/Plus4/Plus4.cpp
+++ b/Machines/Commodore/Plus4/Plus4.cpp
@@ -726,6 +726,9 @@ private:
 	// MARK: - Confidence.
 	Analyser::Dynamic::ConfidenceCounter confidence_;
 	float get_confidence() final { return confidence_.get_confidence(); }
+	std::string debug_type() final {
+		return "Plus4";
+	}
 
 	// MARK: - Configuration options.
 	std::unique_ptr<Reflection::Struct> get_options() const final {
diff --git a/Machines/Commodore/Vic-20/Vic20.cpp b/Machines/Commodore/Vic-20/Vic20.cpp
index 90b0a9c95..fe3a93178 100644
--- a/Machines/Commodore/Vic-20/Vic20.cpp
+++ b/Machines/Commodore/Vic-20/Vic20.cpp
@@ -768,6 +768,9 @@ private:
 	// MARK: - Confidence.
 	Analyser::Dynamic::ConfidenceCounter confidence_;
 	float get_confidence() final { return confidence_.get_confidence(); }
+	std::string debug_type() final {
+		return "Vic20";
+	}
 };
 
 }