diff --git a/newlib/ChangeLog b/newlib/ChangeLog
index 7ab9ba1d4..a964578b8 100644
--- a/newlib/ChangeLog
+++ b/newlib/ChangeLog
@@ -1,3 +1,10 @@
+2009-03-26  Corinna Vinschen  <corinna@vinschen.de>
+
+	* libc/ctype/ctype_.c (_CTYPE_DATA_0_127): Mark TAB as blank character.
+	* libc/ctype/isblank.c: Replace hardcoded test with test for having _B
+	marker in ctype array.
+	* libc/include/ctype.h (isblank): Add macro.
+
 2009-03-25  Craig Howland <howland@LGSInnovations.com>
 
 	* libc/include/math.h:  (llround, llroundf): Declare.
diff --git a/newlib/libc/ctype/ctype_.c b/newlib/libc/ctype/ctype_.c
index 6fa30b207..71756431b 100644
--- a/newlib/libc/ctype/ctype_.c
+++ b/newlib/libc/ctype/ctype_.c
@@ -39,7 +39,7 @@ static char sccsid[] = "@(#)ctype_.c	5.6 (Berkeley) 6/1/90";
 
 #define _CTYPE_DATA_0_127 \
 	_C,	_C,	_C,	_C,	_C,	_C,	_C,	_C, \
-	_C,	_C|_S,	_C|_S,	_C|_S,	_C|_S,	_C|_S,	_C,	_C, \
+	_C,	_B|_C|_S, _C|_S, _C|_S,	_C|_S,	_C|_S,	_C,	_C, \
 	_C,	_C,	_C,	_C,	_C,	_C,	_C,	_C, \
 	_C,	_C,	_C,	_C,	_C,	_C,	_C,	_C, \
 	_S|_B,	_P,	_P,	_P,	_P,	_P,	_P,	_P, \
diff --git a/newlib/libc/ctype/isblank.c b/newlib/libc/ctype/isblank.c
index 3e124d8f7..0567b40b9 100644
--- a/newlib/libc/ctype/isblank.c
+++ b/newlib/libc/ctype/isblank.c
@@ -37,5 +37,5 @@ No supporting OS subroutines are required.
 int
 _DEFUN(isblank,(c),int c)
 {
-	return (c == ' ' || c == '\t');
+	return(__ctype_ptr__[c+1] & _B);
 }
diff --git a/newlib/libc/include/ctype.h b/newlib/libc/include/ctype.h
index a7c7ca2ef..74cfb6f23 100644
--- a/newlib/libc/include/ctype.h
+++ b/newlib/libc/include/ctype.h
@@ -54,6 +54,10 @@ extern	__IMPORT _CONST char	*__ctype_ptr__;
 #define	isgraph(c)	((__ctype_ptr__)[(unsigned)((c)+1)]&(_P|_U|_L|_N))
 #define iscntrl(c)	((__ctype_ptr__)[(unsigned)((c)+1)]&_C)
 
+#if !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901L
+#define isblank(c)      ((__ctype_ptr__)[(unsigned)((c)+1)]&_B)
+#endif
+
 
 /* Non-gcc versions will get the library versions, and will be
    slightly slower */