diff --git a/libbacktrace/ChangeLog b/libbacktrace/ChangeLog
index b2adcb1715f..9cc767b936b 100644
--- a/libbacktrace/ChangeLog
+++ b/libbacktrace/ChangeLog
@@ -1,3 +1,7 @@
+2012-12-12  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	* mmapio.c: Define MAP_FAILED if not defined.
+
 2012-12-11  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/54926
diff --git a/libbacktrace/mmapio.c b/libbacktrace/mmapio.c
index ca8d75de60d..96cc93ab764 100644
--- a/libbacktrace/mmapio.c
+++ b/libbacktrace/mmapio.c
@@ -40,6 +40,10 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include "backtrace.h"
 #include "internal.h"
 
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *)-1)
+#endif
+
 /* This file implements file views and memory allocation when mmap is
    available.  */