diff --git a/cpukit/ChangeLog b/cpukit/ChangeLog
index 6c23e86913..52424fbeae 100644
--- a/cpukit/ChangeLog
+++ b/cpukit/ChangeLog
@@ -1,3 +1,8 @@
+2008-08-2008	Ralf Corsépius <ralf.corsepius@rtems.org>
+
+	* libblock/src/nvdisk.c: Remove bool, true, false (unused, clashes
+	with C99/POSIX).
+
 2008-08-19	Cedric Aubert <cedric_aubert@yahoo.fr>
 
 	PR 500/misc
diff --git a/cpukit/libblock/src/nvdisk.c b/cpukit/libblock/src/nvdisk.c
index 5c96cdeded..80a3b75ad1 100644
--- a/cpukit/libblock/src/nvdisk.c
+++ b/cpukit/libblock/src/nvdisk.c
@@ -54,13 +54,6 @@
 #define RTEMS_NVDISK_TRACE 0
 #endif
 
-/**
- * Provide a basic boolean type.
- */
-#define bool  int
-#define true  (1)
-#define false (0)
-
 /**
  * NV Device Control holds the segment controls
  */