diff --git a/Source/Core/Core/HW/WiimoteReal/IODummy.cpp b/Source/Core/Core/HW/WiimoteReal/IODummy.cpp
index 1c778e6d2c..5b14f9012b 100644
--- a/Source/Core/Core/HW/WiimoteReal/IODummy.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/IODummy.cpp
@@ -64,4 +64,9 @@ int Wiimote::IOWrite(const u8* buf, size_t len)
 	return 0;
 }
 
+void Wiimote::EnablePowerAssertionInternal()
+{}
+void Wiimote::DisablePowerAssertionInternal()
+{}
+
 };
diff --git a/Source/Core/Core/HW/WiimoteReal/IONix.cpp b/Source/Core/Core/HW/WiimoteReal/IONix.cpp
index d322fb4a7f..b94ce5db9a 100644
--- a/Source/Core/Core/HW/WiimoteReal/IONix.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/IONix.cpp
@@ -255,4 +255,9 @@ int Wiimote::IOWrite(u8 const* buf, size_t len)
 	return write(int_sock, buf, (int)len);
 }
 
+void Wiimote::EnablePowerAssertionInternal()
+{}
+void Wiimote::DisablePowerAssertionInternal()
+{}
+
 }; // WiimoteReal
diff --git a/Source/Core/Core/HW/WiimoteReal/IOWin.cpp b/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
index 219c2cd421..e08870d9c9 100644
--- a/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
@@ -783,6 +783,11 @@ int Wiimote::IOWrite(const u8* buf, size_t len)
 	return _IOWrite(dev_handle, hid_overlap_write, stack, buf, len, nullptr);
 }
 
+void Wiimote::EnablePowerAssertionInternal()
+{}
+void Wiimote::DisablePowerAssertionInternal()
+{}
+
 // invokes callback for each found wiimote bluetooth device
 template <typename T>
 void ProcessWiimotes(bool new_scan, T& callback)
diff --git a/Source/Core/Core/HW/WiimoteReal/IOdarwin.mm b/Source/Core/Core/HW/WiimoteReal/IOdarwin.mm
index 06a566fa5a..d2b450dc6b 100644
--- a/Source/Core/Core/HW/WiimoteReal/IOdarwin.mm
+++ b/Source/Core/Core/HW/WiimoteReal/IOdarwin.mm
@@ -72,7 +72,6 @@
 	memcpy(wm->input, data, length);
 	wm->inputlen = length;
 
-	(void)UpdateSystemActivity(UsrActivity);
 	CFRunLoopStop(CFRunLoopGetCurrent());
 }
 
@@ -195,6 +194,7 @@ void Wiimote::InitInternal()
 	m_connected = false;
 	m_wiimote_thread_run_loop = nullptr;
 	btd = nil;
+	m_pm_assertion = kIOPMNullAssertionID;
 }
 
 void Wiimote::TeardownInternal()
@@ -328,4 +328,22 @@ int Wiimote::IOWrite(const unsigned char *buf, size_t len)
 		return 0;
 }
 
+void Wiimote::EnablePowerAssertionInternal()
+{
+	if (m_pm_assertion == kIOPMNullAssertionID)
+	{
+		if (IOReturn ret = IOPMAssertionCreateWithName(kIOPMAssertPreventUserIdleDisplaySleep, kIOPMAssertionLevelOn, CFSTR("Dolphin Wiimote activity"), &m_pm_assertion))
+			ERROR_LOG(WIIMOTE, "Could not create power management assertion: %08x", ret);
+	}
+}
+
+void Wiimote::DisablePowerAssertionInternal()
+{
+	if (m_pm_assertion != kIOPMNullAssertionID)
+	{
+		if (IOReturn ret = IOPMAssertionRelease(m_pm_assertion))
+			ERROR_LOG(WIIMOTE, "Could not release power management assertion: %08x", ret);
+	}
+}
+
 }
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
index bcd4501f7b..1eb3e88003 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
@@ -48,6 +48,7 @@ Wiimote::Wiimote()
 
 Wiimote::~Wiimote()
 {
+	DisablePowerAssertionInternal();
 	StopThread();
 	ClearReadQueue();
 	m_write_reports.Clear();
@@ -334,6 +335,7 @@ bool Wiimote::PrepareOnThread()
 void Wiimote::EmuStart()
 {
 	DisableDataReporting();
+	EnablePowerAssertionInternal();
 }
 
 void Wiimote::EmuStop()
@@ -343,6 +345,8 @@ void Wiimote::EmuStop()
 	DisableDataReporting();
 
 	NOTICE_LOG(WIIMOTE, "Stopping Wiimote data reporting.");
+
+	DisablePowerAssertionInternal();
 }
 
 void Wiimote::EmuResume()
@@ -358,6 +362,8 @@ void Wiimote::EmuResume()
 	QueueReport(WM_REPORT_MODE, &rpt, sizeof(rpt));
 
 	NOTICE_LOG(WIIMOTE, "Resuming Wiimote data reporting.");
+
+	EnablePowerAssertionInternal();
 }
 
 void Wiimote::EmuPause()
@@ -371,6 +377,8 @@ void Wiimote::EmuPause()
 	QueueReport(WM_REPORT_MODE, &rpt, sizeof(rpt));
 
 	NOTICE_LOG(WIIMOTE, "Pausing Wiimote data reporting.");
+
+	DisablePowerAssertionInternal();
 }
 
 static unsigned int CalculateConnectedWiimotes()
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
index 1cd34b5e8d..fa167a81a2 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
@@ -47,6 +47,9 @@ public:
 	void EmuResume();
 	void EmuPause();
 
+	void EnablePowerAssertionInternal();
+	void DisablePowerAssertionInternal();
+
 	// connecting and disconnecting from physical devices
 	// (using address inserted by FindWiimotes)
 	// these are called from the wiimote's thread.
@@ -80,6 +83,7 @@ public:
 	int inputlen;
 	bool m_connected;
 	CFRunLoopRef m_wiimote_thread_run_loop;
+	IOPMAssertionID m_pm_assertion;
 #elif defined(__linux__) && HAVE_BLUEZ
 	bdaddr_t bdaddr;                    // Bluetooth address
 	int cmd_sock;                       // Command socket
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteRealBase.h b/Source/Core/Core/HW/WiimoteReal/WiimoteRealBase.h
index 4d1f6a2d36..847720ba98 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteRealBase.h
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteRealBase.h
@@ -15,6 +15,7 @@
 	#define NS_ENUM_AVAILABLE(...)
 	// end hack
 	#import <IOBluetooth/IOBluetooth.h>
+	#include <IOKit/pwr_mgt/IOPMLib.h>
 #elif defined(__linux__) && HAVE_BLUEZ
 	#include <bluetooth/bluetooth.h>
 #endif