diff --git a/InstructionSets/M68k/Sequence.cpp b/InstructionSets/M68k/Sequence.cpp
index ded0749b8..c47e7bf25 100644
--- a/InstructionSets/M68k/Sequence.cpp
+++ b/InstructionSets/M68k/Sequence.cpp
@@ -8,6 +8,8 @@
 
 #include "Sequence.hpp"
 
+#include <cassert>
+
 using namespace InstructionSet::M68k;
 
 template <Step... T> struct Steps {
@@ -21,7 +23,7 @@ template <Step F, Step... T> struct Steps<F, T...> {
 template<Model model> uint32_t Sequence<model>::steps_for(Operation operation) {
 	switch(operation) {
 		// This handles a NOP, and not much else.
-		default: return 0;
+		default: assert(false);
 
 		//
 		// No operands that require fetching.
diff --git a/OSBindings/Mac/Clock SignalTests/68000ComparativeTests.mm b/OSBindings/Mac/Clock SignalTests/68000ComparativeTests.mm
index b57921542..f96c29449 100644
--- a/OSBindings/Mac/Clock SignalTests/68000ComparativeTests.mm	
+++ b/OSBindings/Mac/Clock SignalTests/68000ComparativeTests.mm	
@@ -28,7 +28,7 @@
 
 - (void)setUp {
 	// To limit tests run to a subset of files and/or of tests, uncomment and fill in below.
-	_fileSet = [NSSet setWithArray:@[@"ext.json"]];
+	_fileSet = [NSSet setWithArray:@[@"add_sub.json"]];
 //	_fileSet = [NSSet setWithArray:@[@"jmp_jsr.json"]];
 //	_testSet = [NSSet setWithArray:@[@"CHK 41a8"]];
 }