diff --git a/ChangeLog b/ChangeLog
index c94308ff80..cdb739ea6f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2008-08-07  Ulrich Drepper  <drepper@redhat.com>
+
+	[BZ #6824]
+	* sysdeps/unix/sysv/linux/powerpc/bits/mathinline.h: Use correct
+	macro to detect use of 128 bit long double.
+	Patch by Ryan S. Arnold <rsa@us.ibm.com>.
+
 2008-08-05  Ulrich Drepper  <drepper@redhat.com>
 
 	* scripts/gen-as-const.awk: Use 32-bit values on 32-bit platforms.
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/mathinline.h b/sysdeps/unix/sysv/linux/powerpc/bits/mathinline.h
index 4f173912ed..4fa4bcaf16 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/mathinline.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/mathinline.h
@@ -72,7 +72,7 @@ __NTH (__signbit (double __x))
   __extension__ union { double __d; int __i[2]; } __u = { __d: __x };
   return __u.__i[0] < 0;
 }
-#  ifdef __LONGDOUBLE128
+#  ifdef __LONG_DOUBLE_128__
 __MATH_INLINE int
 __NTH (__signbitl (long double __x))
 {