diff --git a/Code/Commando/init.cpp b/Code/Commando/init.cpp
index 8c26d98b6..9ddc0f421 100644
--- a/Code/Commando/init.cpp
+++ b/Code/Commando/init.cpp
@@ -282,7 +282,11 @@ void Commando_Assert_Handler(const char * message)
 	// If the exception handler is try to quit the game then don't show an assert.
 	//
 	if (Is_Trying_To_Exit()) {
+#ifdef _WIN32
 		ExitProcess(0);
+#else
+		_exit(0);
+#endif
 	}
 
 	//
diff --git a/Code/wwdebug/wwdebug.cpp b/Code/wwdebug/wwdebug.cpp
index d0d789f8b..c710f2adc 100644
--- a/Code/wwdebug/wwdebug.cpp
+++ b/Code/wwdebug/wwdebug.cpp
@@ -308,7 +308,11 @@ void WWDebug_Assert_Fail(const char * expr,const char * file, int line)
 		// If the exception handler is try to quit the game then don't show an assert.
 		*/
 		if (Is_Trying_To_Exit()) {
+#ifdef _WIN32
 			ExitProcess(0);
+#else
+			_exit(0);
+#endif
 		}
 
       char assertbuf[4096];
diff --git a/Code/wwlib/Except.h b/Code/wwlib/Except.h
index 3aaa2d5b8..135a70b64 100644
--- a/Code/wwlib/Except.h
+++ b/Code/wwlib/Except.h
@@ -82,6 +82,12 @@ typedef struct tThreadInfoType {
 } ThreadInfoType;
 
 
+#else
+
+#define Is_Trying_To_Exit() false
+#define Register_Thread_ID(ID, NAME)
+#define Unregister_Thread_ID(ID, NAME)
+#define Set_Exit_On_Exception(V)
 
 #endif	//_MSC_VER