diff --git a/ChangeLog b/ChangeLog
index 8f06d2217..1d9583c18 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2012-01-14  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	* grub-core/lib/posix_wrap/wctype.h (CHARCLASS_NAME_MAX): New define.
+
 2012-01-14  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* include/grub/datetime.h (grub_datetime2unixtime): Fix offset.
diff --git a/grub-core/lib/posix_wrap/wctype.h b/grub-core/lib/posix_wrap/wctype.h
index b2b33ab08..0dab48b97 100644
--- a/grub-core/lib/posix_wrap/wctype.h
+++ b/grub-core/lib/posix_wrap/wctype.h
@@ -29,6 +29,8 @@ typedef enum { GRUB_CTYPE_INVALID,
 	       GRUB_CTYPE_GRAPH, GRUB_CTYPE_PUNCT, GRUB_CTYPE_XDIGIT,
 	       GRUB_CTYPE_MAX} wctype_t;
 
+#define CHARCLASS_NAME_MAX (sizeof ("xdigit") - 1)
+
 static inline wctype_t
 wctype (const char *name)
 {