diff --git a/Components/6850/6850.cpp b/Components/6850/6850.cpp
index 100f82c8d..561a1caac 100644
--- a/Components/6850/6850.cpp
+++ b/Components/6850/6850.cpp
@@ -129,8 +129,8 @@ ClockingHint::Preference ACIA::preferred_clocking() const {
 	// because it's unclear when the interrupt might come.
 	if(bits_incoming_ && receive_interrupt_enabled_) return ClockingHint::Preference::RealTime;
 
-	// No clocking required then.
-	return ClockingHint::Preference::None;
+	// Real-time clocking not required then.
+	return ClockingHint::Preference::JustInTime;
 }
 
 bool ACIA::get_interrupt_line() const {
diff --git a/Components/68901/MFP68901.cpp b/Components/68901/MFP68901.cpp
index c44fa8883..c2f04d631 100644
--- a/Components/68901/MFP68901.cpp
+++ b/Components/68901/MFP68901.cpp
@@ -208,7 +208,7 @@ void MFP68901::run_for(HalfCycles time) {
 }
 
 HalfCycles MFP68901::get_next_sequence_point() {
-	return HalfCycles(-1);
+	return HalfCycles::max();
 }
 
 // MARK: - Timers
diff --git a/Machines/Atari/ST/DMAController.cpp b/Machines/Atari/ST/DMAController.cpp
index 0259d5ed3..104d5efc5 100644
--- a/Machines/Atari/ST/DMAController.cpp
+++ b/Machines/Atari/ST/DMAController.cpp
@@ -252,7 +252,7 @@ void DMAController::set_component_prefers_clocking(ClockingHint::Source *, Clock
 }
 
 ClockingHint::Preference DMAController::preferred_clocking() const {
-	return (fdc_.preferred_clocking() == ClockingHint::Preference::None) ? ClockingHint::Preference::None : ClockingHint::Preference::RealTime;
+	return (fdc_.preferred_clocking() == ClockingHint::Preference::None) ? ClockingHint::Preference::JustInTime : ClockingHint::Preference::RealTime;
 }
 
 void DMAController::set_activity_observer(Activity::Observer *observer) {