@@ -17,11 +17,13 @@
 #import "OFStream.h"
 
 OF_ASSUME_NONNULL_BEGIN
 
 #if defined(OF_MORPHOS) && !defined(OF_IXEMUL)
-typedef long BPTR;
+# define BOOL EXEC_BOOL
+# include <proto/dos.h>
+# undef BOOL
 #endif
 
 /*!
  * @class OFStdIOStream OFStdIOStream.h ObjFW/OFStdIOStream.h
  *