diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 4f7907aac43..5bd9387c3ca 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2017-07-13  Richard Earnshaw  <rearnsha@arm.com>
+
+	* config/arm/vxworks.h (TARGET_ENDIAN_DEFAULT): Define.
+
 2017-07-13  Maxim Ostapenko  <m.ostapenko@samsung.com>
 
 	* asan.c (asan_emit_allocas_unpoison): Use ptr_mode for arguments
diff --git a/gcc/config/arm/vxworks.h b/gcc/config/arm/vxworks.h
index 9af37c7f4f5..f20324f144d 100644
--- a/gcc/config/arm/vxworks.h
+++ b/gcc/config/arm/vxworks.h
@@ -117,3 +117,6 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 /* This platform supports the probing method of stack checking (RTP mode).
    8K is reserved in the stack to propagate exceptions in case of overflow.  */
 #define STACK_CHECK_PROTECT 8192
+
+/* Unless overridded by the target options, the default is little-endian.  */
+#define TARGET_ENDIAN_DEFAULT 0