diff --git a/backends/base-backend.cpp b/backends/base-backend.cpp
index 9164b8d7216..d232a193a8f 100644
--- a/backends/base-backend.cpp
+++ b/backends/base-backend.cpp
@@ -40,12 +40,6 @@ void BaseBackend::displayMessageOnOSD(const char *msg) {
 }
 
 void BaseBackend::initBackend() {
-	// Init Event manager
-#ifndef DISABLE_DEFAULT_EVENT_MANAGER
-	if (!_eventManager)
-		_eventManager = new DefaultEventManager(getDefaultEventSource());
-#endif
-
 	// Init audio CD manager
 #ifndef DISABLE_DEFAULT_AUDIOCD_MANAGER
 	if (!_audiocdManager)
@@ -61,3 +55,13 @@ void BaseBackend::fillScreen(uint32 col) {
 		screen->fillRect(Common::Rect(screen->w, screen->h), col);
 	unlockScreen();
 }
+
+void EventsBaseBackend::initBackend() {
+	// Init Event manager
+#ifndef DISABLE_DEFAULT_EVENT_MANAGER
+	if (!_eventManager)
+		_eventManager = new DefaultEventManager(this);
+#endif
+
+	BaseBackend::initBackend();
+}
diff --git a/backends/base-backend.h b/backends/base-backend.h
index 6d074a4c3e4..657a24a0997 100644
--- a/backends/base-backend.h
+++ b/backends/base-backend.h
@@ -27,8 +27,6 @@
 #include "common/events.h"
 
 class BaseBackend : public OSystem {
-protected:
-	virtual Common::EventSource *getDefaultEventSource() = 0;
 public:
 	virtual void initBackend();
 
@@ -37,10 +35,9 @@ public:
 	virtual void fillScreen(uint32 col);
 };
 
-class EventsBaseBackend : public BaseBackend, Common::EventSource {
-protected:
-	virtual Common::EventSource *getDefaultEventSource() { return this; }
+class EventsBaseBackend : virtual public BaseBackend, Common::EventSource {
 public:
+	virtual void initBackend();
 };
 
 
diff --git a/backends/platform/3ds/config.cpp b/backends/platform/3ds/config.cpp
index a160ac99509..0fe7f700aa9 100644
--- a/backends/platform/3ds/config.cpp
+++ b/backends/platform/3ds/config.cpp
@@ -74,7 +74,7 @@ void loadConfig() {
 		gspLcdExit();
 	}
 
-	OSystem_3DS *osys = (OSystem_3DS *)g_system;
+	OSystem_3DS *osys = dynamic_cast<OSystem_3DS *>(g_system);
 	osys->updateConfig();
 }
 
diff --git a/backends/platform/3ds/osystem-audio.cpp b/backends/platform/3ds/osystem-audio.cpp
index 6f16a58ad12..b9a4cc7a3ef 100644
--- a/backends/platform/3ds/osystem-audio.cpp
+++ b/backends/platform/3ds/osystem-audio.cpp
@@ -29,7 +29,7 @@ static bool hasAudio = false;
 
 static void audioThreadFunc(void *arg) {
 	Audio::MixerImpl *mixer = (Audio::MixerImpl *)arg;
-	OSystem_3DS *osys = (OSystem_3DS *)g_system;
+	OSystem_3DS *osys = dynamic_cast<OSystem_3DS *>(g_system);
 
 	const int channel = 0;
 	int bufferIndex = 0;
diff --git a/backends/platform/3ds/osystem-events.cpp b/backends/platform/3ds/osystem-events.cpp
index 7f4928d691e..c26306a2edd 100644
--- a/backends/platform/3ds/osystem-events.cpp
+++ b/backends/platform/3ds/osystem-events.cpp
@@ -91,7 +91,7 @@ static void doJoyEvent(Common::Queue<Common::Event> *queue, u32 keysPressed, u32
 }
 
 static void eventThreadFunc(void *arg) {
-	OSystem_3DS *osys = (OSystem_3DS *)g_system;
+	OSystem_3DS *osys = dynamic_cast<OSystem_3DS *>(g_system);
 	Common::Queue<Common::Event> *eventQueue = (Common::Queue<Common::Event> *)arg;
 
 	uint32 touchStartTime = osys->getMillis();
@@ -206,7 +206,7 @@ static void eventThreadFunc(void *arg) {
 }
 
 static void aptHookFunc(APT_HookType hookType, void *param) {
-	OSystem_3DS *osys = (OSystem_3DS *)g_system;
+	OSystem_3DS *osys = dynamic_cast<OSystem_3DS *>(g_system);
 
 	switch (hookType) {
 		case APTHOOK_ONSUSPEND:
diff --git a/backends/platform/android/android.h b/backends/platform/android/android.h
index 89124aed50e..050efd804e1 100644
--- a/backends/platform/android/android.h
+++ b/backends/platform/android/android.h
@@ -81,9 +81,6 @@ private:
 
 	Common::String getSystemProperty(const char *name) const;
 
-protected:
-	virtual Common::EventSource *getDefaultEventSource() { return this; }
-
 public:
 	OSystem_Android(int audio_sample_rate, int audio_buffer_size);
 	virtual ~OSystem_Android();
diff --git a/backends/platform/ds/arm9/source/wordcompletion.cpp b/backends/platform/ds/arm9/source/wordcompletion.cpp
index 2257c49005e..eb0d5d79146 100644
--- a/backends/platform/ds/arm9/source/wordcompletion.cpp
+++ b/backends/platform/ds/arm9/source/wordcompletion.cpp
@@ -104,7 +104,7 @@ bool findWordCompletions(const char *input) {
 	if (wordBufferPtrPos == 0)
 		return false;
 
-	OSystem_DS *system = (OSystem_DS *) g_system;
+	OSystem_DS *system = dynamic_cast<OSystem_DS *>(g_system);
 	system->clearAutoComplete();
 
 	int start = 0;
diff --git a/backends/platform/ios7/ios7_osys_main.cpp b/backends/platform/ios7/ios7_osys_main.cpp
index 23278a30df7..90bb5d69333 100644
--- a/backends/platform/ios7/ios7_osys_main.cpp
+++ b/backends/platform/ios7/ios7_osys_main.cpp
@@ -353,7 +353,7 @@ void OSystem_iOS7::addSysArchivesToSearchSet(Common::SearchSet &s, int priority)
 }
 
 bool iOS7_touchpadModeEnabled() {
-	OSystem_iOS7 *sys = (OSystem_iOS7 *) g_system;
+	OSystem_iOS7 *sys = dynamic_cast<OSystem_iOS7 *>(g_system);
 	return sys && sys->touchpadModeEnabled();
 }
 
diff --git a/backends/platform/n64/osys_n64_utilities.cpp b/backends/platform/n64/osys_n64_utilities.cpp
index b3b6d50667b..defe60a0a5b 100644
--- a/backends/platform/n64/osys_n64_utilities.cpp
+++ b/backends/platform/n64/osys_n64_utilities.cpp
@@ -24,7 +24,7 @@
 #include "backends/timer/default/default-timer.h"
 
 void checkTimers(void) {
-	OSystem_N64 *osys = (OSystem_N64 *)g_system;
+	OSystem_N64 *osys = dynamic_cast<OSystem_N64 *>(g_system);
 
 	uint32 curTime = osys->getMillis();
 
@@ -46,7 +46,7 @@ void disableAudioPlayback(void) {
 void enableAudioPlayback(void) {
 	static bool _firstRun = true;
 
-	OSystem_N64 *osys = (OSystem_N64 *)g_system;
+	OSystem_N64 *osys = dynamic_cast<OSystem_N64 *>(g_system);
 	Audio::MixerImpl *localmixer = (Audio::MixerImpl *)osys->getMixer();
 
 	uint32 sampleBufferSize = 3072;
@@ -83,7 +83,7 @@ void vblCallback(void) {
 		sndCallback();
 	}
 
-	((OSystem_N64 *)g_system)->readControllerAnalogInput();
+	dynamic_cast<OSystem_N64 *>(g_system)->readControllerAnalogInput();
 }
 
 void sndCallback() {
@@ -95,7 +95,7 @@ void sndCallback() {
 void refillAudioBuffers(void) {
 	if (!_audioEnabled) return;
 
-	OSystem_N64 *osys = (OSystem_N64 *)g_system;
+	OSystem_N64 *osys = dynamic_cast<OSystem_N64 *>(g_system);
 	byte *sndBuf;
 	Audio::MixerImpl *localmixer = (Audio::MixerImpl *)osys->getMixer();
 
diff --git a/backends/platform/null/null.cpp b/backends/platform/null/null.cpp
index 0840b457f6f..cd6677c60d2 100644
--- a/backends/platform/null/null.cpp
+++ b/backends/platform/null/null.cpp
@@ -72,7 +72,6 @@ public:
 
 	virtual void initBackend();
 
-	virtual Common::EventSource *getDefaultEventSource() { return this; }
 	virtual bool pollEvent(Common::Event &event);
 
 	virtual uint32 getMillis(bool skipRecord = false);
diff --git a/backends/platform/sdl/sdl.h b/backends/platform/sdl/sdl.h
index 4722b1fd1fa..0acb9beb9c8 100644
--- a/backends/platform/sdl/sdl.h
+++ b/backends/platform/sdl/sdl.h
@@ -124,8 +124,6 @@ protected:
 	 */
 	SdlWindow *_window;
 
-	virtual Common::EventSource *getDefaultEventSource() override { return _eventSource; }
-
 	/**
 	 * Initialze the SDL library.
 	 */
diff --git a/common/system.h b/common/system.h
index 32838c001d0..a808e85278f 100644
--- a/common/system.h
+++ b/common/system.h
@@ -149,7 +149,7 @@ protected:
 
 	/**
 	 * No default value is provided for _eventManager by OSystem.
-	 * However, BaseBackend::initBackend() does set a default value
+	 * However, EventsBaseBackend::initBackend() does set a default value
 	 * if none has been set before.
 	 *
 	 * @note _eventManager is deleted by the OSystem destructor.