diff --git a/libbacktrace/ChangeLog b/libbacktrace/ChangeLog
index 2afa4705539..b38e2fee45c 100644
--- a/libbacktrace/ChangeLog
+++ b/libbacktrace/ChangeLog
@@ -1,3 +1,7 @@
+2016-02-06  John David Anglin  <danglin@gcc.gnu.org>
+
+	* mmap.c (MAP_FAILED): Define if not defined.
+
 2016-01-04  Jakub Jelinek  <jakub@redhat.com>
 
 	Update copyright years.
diff --git a/libbacktrace/mmap.c b/libbacktrace/mmap.c
index 0ed4802d02d..138ef70711a 100644
--- a/libbacktrace/mmap.c
+++ b/libbacktrace/mmap.c
@@ -50,6 +50,10 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #define MAP_ANONYMOUS MAP_ANON
 #endif
 
+#ifndef MAP_FAILED
+#define MAP_FAILED ((void *)-1)
+#endif
+
 /* A list of free memory blocks.  */
 
 struct backtrace_freelist_struct