Index: src/OFApplication.m
==================================================================
--- src/OFApplication.m
+++ src/OFApplication.m
@@ -47,17 +47,13 @@
 
 #if defined(OF_MACOS)
 # include <crt_externs.h>
 #elif defined(OF_WINDOWS)
 # include <windows.h>
-
 extern int _CRT_glob;
 extern void __wgetmainargs(int *, wchar_t ***, wchar_t ***, int, int *);
 #elif defined(OF_AMIGAOS)
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/exec.h>
 # include <proto/dos.h>
 #elif !defined(OF_IOS)
 extern char **environ;
 #endif

Index: src/OFFile.m
==================================================================
--- src/OFFile.m
+++ src/OFFile.m
@@ -56,13 +56,10 @@
 # include <stdbool.h>
 # include <filesystem.h>
 #endif
 
 #ifdef OF_AMIGAOS
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/dos.h>
 #endif
 
 #ifndef O_BINARY
 # define O_BINARY 0

Index: src/OFFileManager.m
==================================================================
--- src/OFFileManager.m
+++ src/OFFileManager.m
@@ -56,13 +56,10 @@
 # include <direct.h>
 # include <ntdef.h>
 #endif
 
 #ifdef OF_AMIGAOS
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/exec.h>
 # include <proto/dos.h>
 # include <proto/locale.h>
 #endif
 

Index: src/OFLocalization.m
==================================================================
--- src/OFLocalization.m
+++ src/OFLocalization.m
@@ -33,13 +33,10 @@
 # ifdef OF_AMIGAOS4
 #  define __NOLIBBASE__
 #  define __NOGLOBALIFACE__
 #  define __USE_INLINE__
 # endif
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/dos.h>
 # include <proto/exec.h>
 # include <proto/locale.h>
 #endif
 

Index: src/OFStdIOStream.h
==================================================================
--- src/OFStdIOStream.h
+++ src/OFStdIOStream.h
@@ -17,17 +17,11 @@
 
 #import "OFStream.h"
 #import "OFKernelEventObserver.h"
 
 #ifdef OF_AMIGAOS
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/dos.h>
-# ifdef OF_AMIGAOS_M68K
-#  undef INTUITION_CLASSES_H
-# endif
 #endif
 
 OF_ASSUME_NONNULL_BEGIN
 
 /*!

Index: src/OFStdIOStream.m
==================================================================
--- src/OFStdIOStream.m
+++ src/OFStdIOStream.m
@@ -40,13 +40,10 @@
 #import "OFOutOfRangeException.h"
 #import "OFReadFailedException.h"
 #import "OFWriteFailedException.h"
 
 #ifdef OF_AMIGAOS
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/exec.h>
 #endif
 
 /* References for static linking */
 #ifdef OF_WINDOWS

Index: src/OFThread.m
==================================================================
--- src/OFThread.m
+++ src/OFThread.m
@@ -31,13 +31,10 @@
 #include "unistd_wrapper.h"
 
 #include "platform.h"
 
 #ifdef OF_AMIGAOS
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/dos.h>
 #endif
 
 #ifdef OF_WII
 # define nanosleep ogc_nanosleep

Index: src/OFURLHandler_file.m
==================================================================
--- src/OFURLHandler_file.m
+++ src/OFURLHandler_file.m
@@ -65,13 +65,10 @@
 # include <direct.h>
 # include <ntdef.h>
 #endif
 
 #ifdef OF_AMIGAOS
-# ifdef OF_AMIGAOS_M68K
-#  define INTUITION_CLASSES_H
-# endif
 # include <proto/dos.h>
 # include <proto/locale.h>
 #endif
 
 #if defined(OF_WINDOWS)

Index: src/runtime/amiga-library.m
==================================================================
--- src/runtime/amiga-library.m
+++ src/runtime/amiga-library.m
@@ -18,14 +18,10 @@
 #include "config.h"
 
 #import "ObjFW_RT.h"
 #import "private.h"
 
-#ifdef OF_AMIGAOS_M68K
-# define INTUITION_CLASSES_H
-#endif
-
 #include <exec/libraries.h>
 #include <exec/nodes.h>
 #include <exec/resident.h>
 #include <proto/exec.h>
 

Index: src/runtime/linklib/linklib.m
==================================================================
--- src/runtime/linklib/linklib.m
+++ src/runtime/linklib/linklib.m
@@ -19,13 +19,10 @@
 
 #import "ObjFW_RT.h"
 #import "private.h"
 #import "macros.h"
 
-#ifdef OF_AMIGAOS_M68K
-# define INTUITION_CLASSES_H
-#endif
 #include <proto/exec.h>
 
 #import "inline.h"
 
 #include <stdio.h>