diff --git a/Source/Core/Core/CoreTiming.cpp b/Source/Core/Core/CoreTiming.cpp
index 7479d03922..a7b390c4d0 100644
--- a/Source/Core/Core/CoreTiming.cpp
+++ b/Source/Core/Core/CoreTiming.cpp
@@ -232,7 +232,7 @@ u64 GetIdleTicks()
 
 // This is to be called when outside threads, such as the graphics thread, wants to
 // schedule things to be executed on the main thread.
-void ScheduleEvent_Threadsafe(int cyclesIntoFuture, int event_type, u64 userdata)
+void ScheduleEvent_Threadsafe(s64 cyclesIntoFuture, int event_type, u64 userdata)
 {
 	_assert_msg_(POWERPC, !Core::IsCPUThread(), "ScheduleEvent_Threadsafe from wrong thread");
 	if (Core::g_want_determinism)
@@ -271,7 +271,7 @@ void ScheduleEvent_Threadsafe_Immediate(int event_type, u64 userdata)
 }
 
 // To be used from any thread, including the CPU thread
-void ScheduleEvent_AnyThread(int cyclesIntoFuture, int event_type, u64 userdata)
+void ScheduleEvent_AnyThread(s64 cyclesIntoFuture, int event_type, u64 userdata)
 {
 	if (Core::IsCPUThread())
 		ScheduleEvent(cyclesIntoFuture, event_type, userdata);
@@ -310,7 +310,7 @@ static void AddEventToQueue(Event* ne)
 // This must be run ONLY from within the CPU thread
 // cyclesIntoFuture may be VERY inaccurate if called from anything else
 // than Advance
-void ScheduleEvent(int cyclesIntoFuture, int event_type, u64 userdata)
+void ScheduleEvent(s64 cyclesIntoFuture, int event_type, u64 userdata)
 {
 	_assert_msg_(POWERPC, Core::IsCPUThread() || Core::GetState() == Core::CORE_PAUSE,
 				 "ScheduleEvent from wrong thread");
@@ -363,12 +363,13 @@ void RemoveAllEvents(int event_type)
 	RemoveEvent(event_type);
 }
 
-void ForceExceptionCheck(int cycles)
+void ForceExceptionCheck(s64 cycles)
 {
-	if (DowncountToCycles(PowerPC::ppcState.downcount) > cycles)
+	if (s64(DowncountToCycles(PowerPC::ppcState.downcount)) > cycles)
 	{
-		slicelength -= (DowncountToCycles(PowerPC::ppcState.downcount) - cycles); // Account for cycles already executed by adjusting the slicelength
-		PowerPC::ppcState.downcount = CyclesToDowncount(cycles);
+		// downcount is always (much) smaller than MAX_INT so we can safely cast cycles to an int here.
+		slicelength -= (DowncountToCycles(PowerPC::ppcState.downcount) - (int)cycles); // Account for cycles already executed by adjusting the g_slicelength
+		PowerPC::ppcState.downcount = CyclesToDowncount((int)cycles);
 	}
 }
 
diff --git a/Source/Core/Core/CoreTiming.h b/Source/Core/Core/CoreTiming.h
index 287ea38ccc..066ef6ae29 100644
--- a/Source/Core/Core/CoreTiming.h
+++ b/Source/Core/Core/CoreTiming.h
@@ -45,11 +45,11 @@ int RegisterEvent(const std::string& name, TimedCallback callback);
 void UnregisterAllEvents();
 
 // userdata MAY NOT CONTAIN POINTERS. userdata might get written and reloaded from savestates.
-void ScheduleEvent(int cyclesIntoFuture, int event_type, u64 userdata = 0);
+void ScheduleEvent(s64 cyclesIntoFuture, int event_type, u64 userdata = 0);
 void ScheduleEvent_Immediate(int event_type, u64 userdata = 0);
-void ScheduleEvent_Threadsafe(int cyclesIntoFuture, int event_type, u64 userdata = 0);
+void ScheduleEvent_Threadsafe(s64 cyclesIntoFuture, int event_type, u64 userdata = 0);
 void ScheduleEvent_Threadsafe_Immediate(int event_type, u64 userdata = 0);
-void ScheduleEvent_AnyThread(int cyclesIntoFuture, int event_type, u64 userdata = 0);
+void ScheduleEvent_AnyThread(s64 cyclesIntoFuture, int event_type, u64 userdata = 0);
 
 // We only permit one event of each type in the queue at a time.
 void RemoveEvent(int event_type);
@@ -77,7 +77,7 @@ void SetFakeTBStartValue(u64 val);
 u64 GetFakeTBStartTicks();
 void SetFakeTBStartTicks(u64 val);
 
-void ForceExceptionCheck(int cycles);
+void ForceExceptionCheck(s64 cycles);
 
 extern int slicelength;
 extern float lastOCFactor;