diff --git a/Machines/Atari2600/Atari2600.cpp b/Machines/Atari2600/Atari2600.cpp
index 0ff4a2ed5..5baa9daee 100644
--- a/Machines/Atari2600/Atari2600.cpp
+++ b/Machines/Atari2600/Atari2600.cpp
@@ -100,7 +100,7 @@ void Machine::switch_region()
 
 void Machine::close_output()
 {
-	_crt.reset();
+	_crt = nullptr;
 }
 
 Machine::~Machine()
diff --git a/Machines/Vic-20/Vic20.cpp b/Machines/Vic-20/Vic20.cpp
index 9f9c2a86b..ca19e6c70 100644
--- a/Machines/Vic-20/Vic20.cpp
+++ b/Machines/Vic-20/Vic20.cpp
@@ -122,6 +122,11 @@ void Machine::setup_output(float aspect_ratio)
 	_mos6560.reset(new MOS::MOS6560());
 }
 
+void Machine::close_output()
+{
+	_mos6560 = nullptr;
+}
+
 void Machine::set_rom(ROMSlot slot, size_t length, const uint8_t *data)
 {
 	uint8_t *target = nullptr;
diff --git a/Machines/Vic-20/Vic20.hpp b/Machines/Vic-20/Vic20.hpp
index 28b5d6926..a7dc1d692 100644
--- a/Machines/Vic-20/Vic20.hpp
+++ b/Machines/Vic-20/Vic20.hpp
@@ -167,7 +167,7 @@ class Machine:
 
 		// to satisfy CRTMachine::Machine
 		virtual void setup_output(float aspect_ratio);
-		virtual void close_output() {}
+		virtual void close_output();
 		virtual std::shared_ptr<Outputs::CRT::CRT> get_crt() { return _mos6560->get_crt(); }
 		virtual std::shared_ptr<Outputs::Speaker> get_speaker() { return _mos6560->get_speaker(); }
 		virtual void run_for_cycles(int number_of_cycles) { CPU6502::Processor<Machine>::run_for_cycles(number_of_cycles); }