diff --git a/ChangeLog b/ChangeLog
index 2ddc860bc8..0a80111a73 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-02-17  Thomas Schwinge  <thomas@schwinge.name>
+
+	[BZ #4822]
+	* sysdeps/mach/hurd/malloc-machine.h: #include <sys/mman.h>.
+	(madvise): Cast every argument to void on its own.
+
 2012-02-17  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #9902]
diff --git a/sysdeps/mach/hurd/malloc-machine.h b/sysdeps/mach/hurd/malloc-machine.h
index 56ae26db62..4a8bd16e6c 100644
--- a/sysdeps/mach/hurd/malloc-machine.h
+++ b/sysdeps/mach/hurd/malloc-machine.h
@@ -63,8 +63,11 @@ __libc_tsd_define (static, void *, MALLOC)	/* declaration/common definition */
 #define tsd_getspecific(key, vptr)	((vptr) = __libc_tsd_get (void *, MALLOC))
 
 /* madvise is a stub on Hurd, so don't bother calling it.  */
+
+#include <sys/mman.h>
+
 #undef	madvise
-#define madvise(addr, len, advice)	((void) ((addr), (len), (advice)))
+#define madvise(addr, len, advice)	((void) (addr), (void) (len), (void) (advice))
 
 #include <sysdeps/generic/malloc-machine.h>