diff --git a/glib/giochannel.h b/glib/giochannel.h
index 0e7c77d4c..a1578b12a 100644
--- a/glib/giochannel.h
+++ b/glib/giochannel.h
@@ -89,15 +89,13 @@ typedef enum
   G_IO_FLAG_NONBLOCK = 1 << 1,
   G_IO_FLAG_IS_READABLE = 1 << 2,	/* Read only flag */
   G_IO_FLAG_IS_WRITABLE = 1 << 3,	/* Read only flag */
+  G_IO_FLAG_IS_WRITEABLE = 1 << 3,      /* Misspelling in 2.29.10 and earlier */
   G_IO_FLAG_IS_SEEKABLE = 1 << 4,	/* Read only flag */
   G_IO_FLAG_MASK = (1 << 5) - 1,
   G_IO_FLAG_GET_MASK = G_IO_FLAG_MASK,
   G_IO_FLAG_SET_MASK = G_IO_FLAG_APPEND | G_IO_FLAG_NONBLOCK
 } GIOFlags;
 
-/* Misspelling in enum in 2.29.10 and earlier */
-#define G_IO_FLAG_IS_WRITEABLE (G_IO_FLAG_IS_WRITABLE)
-
 struct _GIOChannel
 {
   /*< private >*/