diff --git a/InstructionSets/x86/Implementation/Arithmetic.hpp b/InstructionSets/x86/Implementation/Arithmetic.hpp
index e36aba1c1..619dead80 100644
--- a/InstructionSets/x86/Implementation/Arithmetic.hpp
+++ b/InstructionSets/x86/Implementation/Arithmetic.hpp
@@ -132,6 +132,7 @@ void imul(
 	modify_t<IntT> destination_high,
 	modify_t<IntT> destination_low,
 	read_t<IntT> source,
+	read_t<IntT> multiplicand,
 	ContextT &context
 ) {
 	/*
@@ -160,8 +161,8 @@ void imul(
 		FI;
 	*/
 	using sIntT = typename std::make_signed<IntT>::type;
-	destination_high = IntT((sIntT(destination_low) * sIntT(source)) >> (8 * sizeof(IntT)));
-	destination_low = IntT(sIntT(destination_low) * sIntT(source));
+	destination_high = IntT((sIntT(multiplicand) * sIntT(source)) >> (8 * sizeof(IntT)));
+	destination_low = IntT(sIntT(multiplicand) * sIntT(source));
 
 	const auto sign_extension = (destination_low & Numeric::top_bit<IntT>()) ? IntT(~0) : 0;
 	context.flags.template set_from<Flag::Overflow, Flag::Carry>(destination_high != sign_extension);
diff --git a/InstructionSets/x86/Implementation/PerformImplementation.hpp b/InstructionSets/x86/Implementation/PerformImplementation.hpp
index f70b60278..67288379f 100644
--- a/InstructionSets/x86/Implementation/PerformImplementation.hpp
+++ b/InstructionSets/x86/Implementation/PerformImplementation.hpp
@@ -241,7 +241,12 @@ template <
 		return;
 
 		case Operation::MUL:		Primitive::mul<IntT>(pair_high(), pair_low(), source_r(), context);			return;
-		case Operation::IMUL_1:		Primitive::imul<IntT>(pair_high(), pair_low(), source_r(), context);		return;
+		case Operation::IMUL_1:
+			Primitive::imul<IntT>(pair_high(), pair_low(), source_r(), pair_low(), context);
+		return;
+		case Operation::IMUL_3:
+			Primitive::imul<IntT>(pair_high(), pair_low(), source_r(), IntT(instruction.operand()), context);
+		return;
 		case Operation::DIV:		Primitive::div<IntT>(pair_high(), pair_low(), source_r(), context);			return;
 		case Operation::IDIV:		Primitive::idiv<false, IntT>(pair_high(), pair_low(), source_r(), context);	return;
 		case Operation::IDIV_REP:
@@ -570,7 +575,6 @@ template <
 		//	LSL
 		//	LTR
 		//	STR
-		//	IMUL_3
 		//	LOADALL
 	}
 
@@ -647,7 +651,8 @@ void perform(
 
 	// This is reachable only if the data and address size combination in use isn't available
 	// on the processor model nominated.
-	assert(false);}
+	assert(false);
+}
 
 //
 // Public function; just indirects into a trampoline into a version of perform templated on data and address size.
diff --git a/OSBindings/Mac/Clock SignalTests/8088Tests.mm b/OSBindings/Mac/Clock SignalTests/8088Tests.mm
index 415971dbd..2e940fe60 100644
--- a/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/8088Tests.mm	
@@ -258,6 +258,7 @@ NSArray<NSString *> *test_files(const char *const home) {
 //		@"D4.json.gz",		// AAM
 //		@"F6.7.json.gz",	// IDIV byte
 //		@"F7.7.json.gz",	// IDIV word
+		@"C8.json.gz",		// ENTER
 	]];
 
 	NSSet *ignoreList = nil;