diff --git a/ChangeLog b/ChangeLog
index 481a2bd423..74a4de336d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2014-12-22  Steve Ellcey  <sellcey@imgtec.com>
+
+	* sysdeps/unix/mips/sysdep.h (__mips_isa_rev): Set
+	to zero if not already defined.
+
 2014-12-22  Joseph Myers  <joseph@codesourcery.com>
 
 	[BZ #17724]
diff --git a/sysdeps/unix/mips/sysdep.h b/sysdeps/unix/mips/sysdep.h
index d59fac0e8d..dc70c0f400 100644
--- a/sysdeps/unix/mips/sysdep.h
+++ b/sysdeps/unix/mips/sysdep.h
@@ -78,4 +78,8 @@
 # define L(label) .L ## label
 #endif
 
+#ifndef __mips_isa_rev
+# define __mips_isa_rev 0
+#endif
+
 #endif