diff --git a/InstructionSets/x86/Implementation/PerformImplementation.hpp b/InstructionSets/x86/Implementation/PerformImplementation.hpp
index 75342dcc9..af4602a33 100644
--- a/InstructionSets/x86/Implementation/PerformImplementation.hpp
+++ b/InstructionSets/x86/Implementation/PerformImplementation.hpp
@@ -1402,6 +1402,20 @@ void cmps(const InstructionT &instruction, AddressT &eCX, AddressT &eSI, Address
 	repeat_ene<AddressT>(instruction, status, eCX, flow_controller);
 }
 
+template <typename IntT, typename AddressT, typename InstructionT, typename MemoryT, typename FlowControllerT>
+void scas(const InstructionT &instruction, AddressT &eCX, AddressT &eDI, IntT &eAX, MemoryT &memory, Status &status, FlowControllerT &flow_controller) {
+	if(repetition_over<AddressT>(instruction, eCX)) {
+		return;
+	}
+
+	const IntT rhs = memory.template access<IntT>(Source::ES, eDI);
+	eDI += status.direction<AddressT>() * sizeof(IntT);
+
+	Primitive::sub<false, false>(eAX, rhs, status);
+
+	repeat_ene<AddressT>(instruction, status, eCX, flow_controller);
+}
+
 template <typename IntT, typename AddressT, typename InstructionT, typename MemoryT, typename FlowControllerT>
 void lods(const InstructionT &instruction, AddressT &eCX, AddressT &eSI, IntT &eAX, MemoryT &memory, Status &status, FlowControllerT &flow_controller) {
 	if(repetition_over<AddressT>(instruction, eCX)) {
@@ -1698,6 +1712,9 @@ template <
 		case Operation::STOS:
 			Primitive::stos<IntT, AddressT>(instruction, eCX(), eDI(), pair_low(), memory, status, flow_controller);
 		break;
+		case Operation::SCAS:
+			Primitive::scas<IntT, AddressT>(instruction, eCX(), eDI(), pair_low(), memory, status, flow_controller);
+		break;
 	}
 
 	// Write to memory if required to complete this operation.
diff --git a/OSBindings/Mac/Clock SignalTests/8088Tests.mm b/OSBindings/Mac/Clock SignalTests/8088Tests.mm
index 7176b479b..36c756e38 100644
--- a/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
@@ -414,6 +414,9 @@ struct FailedExecution {
 
 		// STOS
 		@"AA.json.gz",	@"AB.json.gz",
+
+		// SCAS
+		@"AE.json.gz",	@"AF.json.gz",
 /*
 		@"E0.json.gz",	// LOOPNE
 		@"E1.json.gz",	// LOOPE