diff --git a/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm b/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm
index 0e3b737e9..68bf1abe1 100644
--- a/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/x86DecoderTests.mm	
@@ -29,14 +29,14 @@ template <typename InstructionT> void test(
 	const InstructionT &instruction,
 	DataSize size,
 	Operation operation,
-	InstructionSet::x86::DataPointer source,
+	std::optional<InstructionSet::x86::DataPointer> source,
 	std::optional<InstructionSet::x86::DataPointer> destination = std::nullopt,
 	std::optional<typename InstructionT::ImmediateT> operand = std::nullopt,
 	std::optional<typename InstructionT::DisplacementT> displacement = std::nullopt) {
 
 	XCTAssertEqual(instruction.operation_size(), InstructionSet::x86::DataSize(size));
 	XCTAssertEqual(instruction.operation, operation);
-	XCTAssert(instruction.source() == source);
+	if(source) XCTAssert(instruction.source() == *source);
 	if(destination) XCTAssert(instruction.destination() == *destination);
 	if(operand)	XCTAssertEqual(instruction.operand(), *operand);
 	if(displacement) XCTAssertEqual(instruction.displacement(), *displacement);
@@ -557,4 +557,75 @@ std::vector<typename InstructionSet::x86::Decoder<model>::InstructionT> decode(c
 	test(instructions[0], DataSize::DWord, Operation::ADD, Source::Immediate, ScaleIndexBase(Source::eDI), 0x9f683aa9, -0x42);
 }
 
+- (void)test286LengthLimit {
+	const auto instructions = decode<Model::i80286>({
+		0x90,
+		0x26, 0x90,
+		0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+	});
+
+	XCTAssertEqual(instructions.size(), 12);
+	test(instructions[0], Operation::NOP);
+	test(instructions[1], Operation::NOP);
+	test(instructions[2], Operation::NOP);
+	test(instructions[3], Operation::NOP);
+	test(instructions[4], Operation::NOP);
+	test(instructions[5], Operation::NOP);
+	test(instructions[6], Operation::NOP);
+	test(instructions[7], Operation::NOP);
+	test(instructions[8], Operation::NOP);
+	test(instructions[9], Operation::NOP);
+	test(instructions[10], Operation::Invalid);
+	test(instructions[11], Operation::NOP);
+}
+
+ - (void)test386LengthLimit {
+	const auto instructions = decode<Model::i80386>({
+		0x90,
+		0x26, 0x90,
+		0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+		0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x26, 0x90,
+	});
+
+	XCTAssertEqual(instructions.size(), 17);
+	test(instructions[0], Operation::NOP);
+	test(instructions[1], Operation::NOP);
+	test(instructions[2], Operation::NOP);
+	test(instructions[3], Operation::NOP);
+	test(instructions[4], Operation::NOP);
+	test(instructions[5], Operation::NOP);
+	test(instructions[6], Operation::NOP);
+	test(instructions[7], Operation::NOP);
+	test(instructions[8], Operation::NOP);
+	test(instructions[9], Operation::NOP);
+	test(instructions[10], Operation::NOP);
+	test(instructions[11], Operation::NOP);
+	test(instructions[12], Operation::NOP);
+	test(instructions[13], Operation::NOP);
+	test(instructions[14], Operation::NOP);
+	test(instructions[15], Operation::Invalid);
+	test(instructions[16], Operation::NOP);
+}
+
+
 @end