diff --git a/src/d_main.cpp b/src/d_main.cpp
index bbc5e8c86..c693a8394 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -110,6 +110,7 @@ EXTERN_CVAR(Bool, hud_althud)
 EXTERN_CVAR(Bool, cl_customizeinvulmap)
 void DrawHUD();
 void D_DoAnonStats();
+void I_DetectOS();
 
 
 // MACROS ------------------------------------------------------------------
@@ -2316,6 +2317,16 @@ static void CheckCmdLine()
 	}
 }
 
+void I_Quit()
+{
+	if (demorecording)
+	{
+		G_CheckDemoStatus();
+	}
+	
+	C_DeinitConsole();
+}
+
 //==========================================================================
 //
 // D_DoomMain
@@ -2335,6 +2346,7 @@ void D_DoomMain (void)
 	
 	C_InitConsole(80*8, 25*8, false);
 	I_DetectOS();
+	atterm(I_Quit);
 
 	// +logfile gets checked too late to catch the full startup log in the logfile so do some extra check for it here.
 	FString logfile = Args->TakeValue("+logfile");
diff --git a/src/posix/cocoa/i_main.mm b/src/posix/cocoa/i_main.mm
index bf5c2ea75..da285ba22 100644
--- a/src/posix/cocoa/i_main.mm
+++ b/src/posix/cocoa/i_main.mm
@@ -135,24 +135,7 @@ void OriginalMainTry(int argc, char** argv)
 {
 	Args = new FArgs(argc, argv);
 
-	/*
-	 killough 1/98:
-
-	 This fixes some problems with exit handling
-	 during abnormal situations.
-
-	 The old code called I_Quit() to end program,
-	 while now I_Quit() is installed as an exit
-	 handler and exit() is called to exit, either
-	 normally or abnormally. Seg faults are caught
-	 and the error handler is used, to prevent
-	 being left in graphics mode or having very
-	 loud SFX noise because the sound card is
-	 left in an unstable state.
-	 */
-
 	atexit(call_terms);
-	atterm(I_Quit);
 
 	NSString* exePath = [[NSBundle mainBundle] executablePath];
 	progdir = [[exePath stringByDeletingLastPathComponent] UTF8String];
diff --git a/src/posix/cocoa/i_system.mm b/src/posix/cocoa/i_system.mm
index 4e2153721..13ccbf349 100644
--- a/src/posix/cocoa/i_system.mm
+++ b/src/posix/cocoa/i_system.mm
@@ -95,20 +95,6 @@ void I_Init(void)
 	I_InitSound();
 }
 
-static int has_exited;
-
-void I_Quit()
-{
-	has_exited = 1; // Prevent infinitely recursive exits -- killough
-
-	if (demorecording)
-	{
-		G_CheckDemoStatus();
-	}
-
-	C_DeinitConsole();
-}
-
 
 extern FILE* Logfile;
 bool gameisdead;
@@ -139,12 +125,7 @@ static void I_FatalError(const char* const error, va_list ap)
 		fprintf(stderr, "%s\n", errortext);
 		exit(-1);
 	}
-
-	if (!has_exited) // If it hasn't exited yet, exit now -- killough
-	{
-		has_exited = 1; // Prevent infinitely recursive exits -- killough
-		exit(-1);
-	}
+	std::terminate();
 }
 
 void I_FatalError(const char* const error, ...)
diff --git a/src/posix/i_system.h b/src/posix/i_system.h
index 1cfab15d7..e317ae385 100644
--- a/src/posix/i_system.h
+++ b/src/posix/i_system.h
@@ -79,12 +79,6 @@ void I_StartTic (void);
 // for normal input.
 ticcmd_t *I_BaseTiccmd (void);
 
-
-// Called by M_Responder when quit is selected.
-// Clean exit, displays sell blurb.
-void I_Quit (void);
-
-
 void I_Tactile (int on, int off, int total);
 
 void I_Error (const char *error, ...) GCCPRINTF(1,2);
diff --git a/src/posix/sdl/i_main.cpp b/src/posix/sdl/i_main.cpp
index 93ef90752..38b2d87e0 100644
--- a/src/posix/sdl/i_main.cpp
+++ b/src/posix/sdl/i_main.cpp
@@ -193,24 +193,7 @@ int main (int argc, char **argv)
     {
 		Args = new FArgs(argc, argv);
 
-		/*
-		  killough 1/98:
-
-		  This fixes some problems with exit handling
-		  during abnormal situations.
-
-		  The old code called I_Quit() to end program,
-		  while now I_Quit() is installed as an exit
-		  handler and exit() is called to exit, either
-		  normally or abnormally. Seg faults are caught
-		  and the error handler is used, to prevent
-		  being left in graphics mode or having very
-		  loud SFX noise because the sound card is
-		  left in an unstable state.
-		*/
-
 		atexit (call_terms);
-		atterm (I_Quit);
 
 		// Should we even be doing anything with progdir on Unix systems?
 		char program[PATH_MAX];
diff --git a/src/posix/sdl/i_system.cpp b/src/posix/sdl/i_system.cpp
index 8258c6e9b..7bbe4fb85 100644
--- a/src/posix/sdl/i_system.cpp
+++ b/src/posix/sdl/i_system.cpp
@@ -116,22 +116,6 @@ void I_Init (void)
 	I_InitSound ();
 }
 
-//
-// I_Quit
-//
-static int has_exited;
-
-void I_Quit (void)
-{
-	has_exited = 1;		/* Prevent infinitely recursive exits -- killough */
-
-	if (demorecording)
-		G_CheckDemoStatus();
-
-	C_DeinitConsole();
-}
-
-
 //
 // I_Error
 //
@@ -203,12 +187,7 @@ void I_FatalError (const char *error, va_list ap)
 		fprintf (stderr, "%s\n", errortext);
 		exit (-1);
 	}
-
-	if (!has_exited)	// If it hasn't exited yet, exit now -- killough
-	{
-		has_exited = 1;	// Prevent infinitely recursive exits -- killough
-		exit(-1);
-	}
+	std::terminate();
 }
 
 void I_FatalError(const char* const error, ...)
diff --git a/src/win32/i_main.cpp b/src/win32/i_main.cpp
index afd278139..3ada8affe 100644
--- a/src/win32/i_main.cpp
+++ b/src/win32/i_main.cpp
@@ -772,6 +772,11 @@ void PeekThreadedErrorPane()
 	PeekMessage(&msg, 0, 0, 0, PM_NOREMOVE);
 }
 
+static void UnTbp()
+{
+	timeEndPeriod(TimerPeriod);
+}
+
 //==========================================================================
 //
 // DoMain
@@ -880,23 +885,10 @@ void DoMain (HINSTANCE hInstance)
 			TimerPeriod = tc.wPeriodMin;
 
 		timeBeginPeriod (TimerPeriod);
-
-		/*
-		killough 1/98:
-
-		This fixes some problems with exit handling
-		during abnormal situations.
-
-		The old code called I_Quit() to end program,
-		while now I_Quit() is installed as an exit
-		handler and exit() is called to exit, either
-		normally or abnormally.
-		*/
+		atexit(UnTbp);
 
 		atexit (call_terms);
 
-		atterm (I_Quit);
-
 		// Figure out what directory the program resides in.
 		WCHAR progbuff[1024];
 		if (GetModuleFileNameW(nullptr, progbuff, sizeof progbuff) == 0)
diff --git a/src/win32/i_system.cpp b/src/win32/i_system.cpp
index 1c70d58cb..bbbb0336c 100644
--- a/src/win32/i_system.cpp
+++ b/src/win32/i_system.cpp
@@ -159,7 +159,6 @@ int sys_ostype = 0;
 // PRIVATE DATA DEFINITIONS ------------------------------------------------
 
 static ticcmd_t emptycmd;
-static bool HasExited;
 
 static WadStuff *WadList;
 static int NumWads;
@@ -358,26 +357,6 @@ void I_Init()
 	I_InitSound ();
 }
 
-//==========================================================================
-//
-// I_Quit
-//
-//==========================================================================
-
-void I_Quit()
-{
-	HasExited = true;		/* Prevent infinitely recursive exits -- killough */
-
-	timeEndPeriod(TimerPeriod);
-
-	if (demorecording)
-	{
-		G_CheckDemoStatus();
-	}
-
-	C_DeinitConsole();
-}
-
 
 //==========================================================================
 //
@@ -411,12 +390,7 @@ void I_FatalError(const char *error, ...)
 
 		throw CFatalError(errortext);
 	}
-
-	if (!HasExited)		// If it hasn't exited yet, exit now -- killough
-	{
-		HasExited = 1;	// Prevent infinitely recursive exits -- killough
-		exit(-1);
-	}
+	std::terminate();
 }
 
 //==========================================================================