diff --git a/ChangeLog b/ChangeLog
index de6646b3d6..fa126348c2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2013-05-07  Aurelien Jarno <aurelien@aurel32.net>
+
+	* misc/sys/param.h (DEV_BSIZE): Define only if not already defined.
+
 2013-05-07  Roland McGrath  <roland@hack.frob.com>
 
 	* sysdeps/generic/ldsodefs.h [IS_IN_rtld]: Declare _dl_skip_args
diff --git a/misc/sys/param.h b/misc/sys/param.h
index 5e6353d1e8..d257ec7576 100644
--- a/misc/sys/param.h
+++ b/misc/sys/param.h
@@ -71,7 +71,9 @@
 
 
 /* Unit of `st_blocks'.  */
-#define DEV_BSIZE       512
+#ifndef DEV_BSIZE
+# define DEV_BSIZE	512
+#endif
 
 
 /* Bit map related macros.  */