diff --git a/Processors/68000Mk2/68000Mk2.hpp b/Processors/68000Mk2/68000Mk2.hpp
index 5defa8eac..b3f4617af 100644
--- a/Processors/68000Mk2/68000Mk2.hpp
+++ b/Processors/68000Mk2/68000Mk2.hpp
@@ -394,6 +394,8 @@ template <class BusHandler, bool dtack_is_implicit = true, bool permit_overrun =
 class Processor: private ProcessorBase {
 	public:
 		Processor(BusHandler &bus_handler) : ProcessorBase(), bus_handler_(bus_handler) {}
+		Processor(const Processor& rhs) = delete;
+		Processor& operator=(const Processor& rhs) = delete;
 
 		void run_for(HalfCycles duration);
 
diff --git a/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp b/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
index f26df65c8..2134522b2 100644
--- a/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
+++ b/Processors/68000Mk2/Implementation/68000Mk2Implementation.hpp
@@ -1091,6 +1091,7 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
 			//	(i) this operand isn't used; or
 			//	(ii) its address calculation will end up conflated with performance,
 			//		so there's no generic bus-accurate approach.
+			assert(next_operand_ >= 0 && next_operand_ < 2);
 			if(!(operand_flags_ & (1 << next_operand_))) {
 				MoveToStateDynamic(perform_state_);
 			}
@@ -1099,6 +1100,7 @@ void Processor<BusHandler, dtack_is_implicit, permit_overrun, signal_will_perfor
 
 		// As above, but for .l.
 		BeginState(FetchOperand_l):
+			assert(next_operand_ >= 0 && next_operand_ < 2);
 			if(!(operand_flags_ & (1 << next_operand_))) {
 				MoveToStateDynamic(perform_state_);
 			}
diff --git a/Processors/68000Mk2/Implementation/68000Mk2Storage.hpp b/Processors/68000Mk2/Implementation/68000Mk2Storage.hpp
index 243c0c86b..95e0a7662 100644
--- a/Processors/68000Mk2/Implementation/68000Mk2Storage.hpp
+++ b/Processors/68000Mk2/Implementation/68000Mk2Storage.hpp
@@ -22,6 +22,8 @@ struct ProcessorBase: public InstructionSet::M68k::NullFlowController {
 	ProcessorBase() {
 		read_program_announce.address = read_program.address = &program_counter_.l;
 	}
+	ProcessorBase(const ProcessorBase& rhs) = delete;
+	ProcessorBase& operator=(const ProcessorBase& rhs) = delete;
 
 	int state_ = std::numeric_limits<int>::min();