diff --git a/src/w32term.h b/src/w32term.h
index f0292d28d94..152d83e2aa6 100644
--- a/src/w32term.h
+++ b/src/w32term.h
@@ -40,6 +40,10 @@ Boston, MA 02111-1307, USA.  */
   ((f)->bdf ? (f)->bdf->width : (f)->tm.tmMaxCharWidth)
 
 #define CP_DEFAULT 1004
+/* Special psuedo-codepages. */
+#define CP_8BIT      -1
+#define CP_UNICODE   -2
+#define CP_INVALID   -3
 
 #define CHECK_W32_FRAME(f, frame)		\
   if (NILP (frame))				\
@@ -51,7 +55,6 @@ Boston, MA 02111-1307, USA.  */
     }						\
   if (! FRAME_W32_P (f))
 
-
 /* Indicates whether we are in the readsocket call and the message we
    are processing in the current loop */