diff --git a/headers/os/support/Errors.h b/headers/os/support/Errors.h
index c14e496c38..6b5ce3c069 100644
--- a/headers/os/support/Errors.h
+++ b/headers/os/support/Errors.h
@@ -210,9 +210,12 @@ enum {
 /*---- new error codes that can be mapped to POSIX errors ----*/
 #define	B_BUFFER_OVERFLOW	EOVERFLOW
 #define	B_NOT_SUPPORTED		EOPNOTSUPP
+	/* there is also B_UNSUPPORTED - but it maps to a different error code;
+	 * should we remove this one again?
+	 */
 #define B_TOO_MANY_ARGS		E2BIG
 #define	B_FILE_TOO_LARGE	EFBIG
-#define B_RESULT_TOO_LARGE	ERANGE
+#define B_RESULT_NOT_REPRESENTABLE	ERANGE
 #define	B_DEVICE_NOT_FOUND	ENODEV
 
 /*-------------------------------------------------------------*/