diff --git a/CHANGES b/CHANGES
index 3d102d1ef..490b28b42 100644
--- a/CHANGES
+++ b/CHANGES
@@ -90,6 +90,7 @@ Misc:
  - GBA: Don't include GBACLIDebugger struct unless needed
  - SDL: Clean up GL context
  - GBA Audio: Implement audio reset for channels A/B
+ - GBA Hardware: Backport generic RTC source into core
 
 0.2.1: (2015-05-13)
 Bugfixes:
diff --git a/src/gba/hardware.c b/src/gba/hardware.c
index b11204e66..e0c341e26 100644
--- a/src/gba/hardware.c
+++ b/src/gba/hardware.c
@@ -17,6 +17,8 @@ static void _rtcProcessByte(struct GBACartridgeHardware* hw);
 static void _rtcUpdateClock(struct GBACartridgeHardware* hw);
 static unsigned _rtcBCD(unsigned value);
 
+static time_t _rtcGenericCallback(struct GBARTCSource* source);
+
 static void _gyroReadPins(struct GBACartridgeHardware* hw);
 
 static void _rumbleReadPins(struct GBACartridgeHardware* hw);
@@ -246,7 +248,9 @@ void _rtcUpdateClock(struct GBACartridgeHardware* hw) {
 	time_t t;
 	struct GBARTCSource* rtc = hw->p->rtcSource;
 	if (rtc) {
-		rtc->sample(rtc);
+		if (rtc->sample) {
+			rtc->sample(rtc);
+		}
 		t = rtc->unixTime(rtc);
 	} else {
 		t = time(0);
@@ -277,6 +281,27 @@ unsigned _rtcBCD(unsigned value) {
 	return counter;
 }
 
+time_t _rtcGenericCallback(struct GBARTCSource* source) {
+	struct GBARTCGenericSource* rtc = (struct GBARTCGenericSource*) source;
+	switch (rtc->override) {
+	case RTC_NO_OVERRIDE:
+	default:
+		return time(0);
+	case RTC_FIXED:
+		return rtc->value;
+	case RTC_FAKE_EPOCH:
+		return rtc->value + rtc->p->video.frameCounter * (int64_t) VIDEO_TOTAL_LENGTH / GBA_ARM7TDMI_FREQUENCY;
+	}
+}
+
+void GBARTCGenericSourceInit(struct GBARTCGenericSource* rtc, struct GBA* gba) {
+	rtc->p = gba;
+	rtc->override = RTC_NO_OVERRIDE;
+	rtc->value = 0;
+	rtc->d.sample = 0;
+	rtc->d.unixTime = _rtcGenericCallback;
+}
+
 // == Gyro
 
 void GBAHardwareInitGyro(struct GBACartridgeHardware* hw) {
@@ -466,7 +491,6 @@ void GBAHardwareDeserialize(struct GBACartridgeHardware* hw, const struct GBASer
 	hw->readWrite = state->hw.readWrite;
 	hw->pinState = state->hw.pinState;
 	hw->direction = state->hw.pinDirection;
-	// TODO: Deterministic RTC
 	hw->rtc = state->hw.rtc;
 	hw->gyroSample = state->hw.gyroSample;
 	hw->gyroEdge = state->hw.gyroEdge;
diff --git a/src/gba/hardware.h b/src/gba/hardware.h
index 11a91f55b..5ba17c221 100644
--- a/src/gba/hardware.h
+++ b/src/gba/hardware.h
@@ -35,6 +35,17 @@ struct GBARTCSource {
 	time_t (*unixTime)(struct GBARTCSource*);
 };
 
+struct GBARTCGenericSource {
+	struct GBARTCSource d;
+	struct GBA* p;
+	enum {
+		RTC_NO_OVERRIDE,
+		RTC_FIXED,
+		RTC_FAKE_EPOCH
+	} override;
+	int64_t value;
+};
+
 enum GBAHardwareDevice {
 	HW_NO_OVERRIDE = 0x8000,
 	HW_NONE = 0,
@@ -132,6 +143,8 @@ uint8_t GBAHardwareTiltRead(struct GBACartridgeHardware* gpio, uint32_t address)
 struct GBAVideo;
 bool GBAHardwarePlayerCheckScreen(const struct GBAVideo* video);
 
+void GBARTCGenericSourceInit(struct GBARTCGenericSource* rtc, struct GBA* gba);
+
 struct GBASerializedState;
 void GBAHardwareSerialize(const struct GBACartridgeHardware* gpio, struct GBASerializedState* state);
 void GBAHardwareDeserialize(struct GBACartridgeHardware* gpio, const struct GBASerializedState* state);
diff --git a/src/platform/qt/GameController.cpp b/src/platform/qt/GameController.cpp
index e0c59deb8..c7fa7c57c 100644
--- a/src/platform/qt/GameController.cpp
+++ b/src/platform/qt/GameController.cpp
@@ -81,27 +81,12 @@ GameController::GameController(QObject* parent)
 	};
 	setLuminanceLevel(0);
 
-	m_rtc.p = this;
-	m_rtc.override = GameControllerRTC::NO_OVERRIDE;
-	m_rtc.sample = [](GBARTCSource* context) {};
-	m_rtc.unixTime = [](GBARTCSource* context) -> time_t {
-		GameControllerRTC* rtc = static_cast<GameControllerRTC*>(context);
-		switch (rtc->override) {
-		case GameControllerRTC::NO_OVERRIDE:
-		default:
-			return time(nullptr);
-		case GameControllerRTC::FIXED:
-			return rtc->value;
-		case GameControllerRTC::FAKE_EPOCH:
-			return rtc->value + rtc->p->m_threadContext.gba->video.frameCounter * (int64_t) VIDEO_TOTAL_LENGTH / GBA_ARM7TDMI_FREQUENCY;
-		}
-	};
-
 	m_threadContext.startCallback = [](GBAThread* context) {
 		GameController* controller = static_cast<GameController*>(context->userData);
 		controller->m_audioProcessor->setInput(context);
 		context->gba->luminanceSource = &controller->m_lux;
-		context->gba->rtcSource = &controller->m_rtc;
+		GBARTCGenericSourceInit(&controller->m_rtc, context->gba);
+		context->gba->rtcSource = &controller->m_rtc.d;
 		context->gba->rumble = controller->m_inputController->rumble();
 		context->gba->rotationSource = controller->m_inputController->rotationSource();
 		controller->m_fpsTarget = context->fpsTarget;
@@ -730,16 +715,16 @@ void GameController::setLuminanceLevel(int level) {
 }
 
 void GameController::setRealTime() {
-	m_rtc.override = GameControllerRTC::NO_OVERRIDE;
+	m_rtc.override = GBARTCGenericSource::RTC_NO_OVERRIDE;
 }
 
 void GameController::setFixedTime(const QDateTime& time) {
-	m_rtc.override = GameControllerRTC::FIXED;
+	m_rtc.override = GBARTCGenericSource::RTC_FIXED;
 	m_rtc.value = time.toMSecsSinceEpoch() / 1000;
 }
 
 void GameController::setFakeEpoch(const QDateTime& time) {
-	m_rtc.override = GameControllerRTC::FAKE_EPOCH;
+	m_rtc.override = GBARTCGenericSource::RTC_FAKE_EPOCH;
 	m_rtc.value = time.toMSecsSinceEpoch() / 1000;
 }
 
diff --git a/src/platform/qt/GameController.h b/src/platform/qt/GameController.h
index e80769dca..349a39ce6 100644
--- a/src/platform/qt/GameController.h
+++ b/src/platform/qt/GameController.h
@@ -205,15 +205,7 @@ private:
 
 	static const int LUX_LEVELS[10];
 
-	struct GameControllerRTC : GBARTCSource {
-		GameController* p;
-		enum {
-			NO_OVERRIDE,
-			FIXED,
-			FAKE_EPOCH
-		} override;
-		int64_t value;
-	} m_rtc;
+	GBARTCGenericSource m_rtc;
 };
 
 }