diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 8734cb3f0b..a550dd761c 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,6 +1,7 @@
 Fri Jun 25 11:22:28 1993  Jim Kingdon  (kingdon@lioth.cygnus.com)
 
 	* config/mips/riscos.mh (REGEX{,1}, MUNCH_DEFINE, MH_CFLAGS): Define.
+	* config/mips/xm-riscos.h: Define USG.
 
 Thu Jun 24 14:52:45 1993  Jim Kingdon  (kingdon@lioth.cygnus.com)
 
diff --git a/gdb/config/mips/xm-riscos.h b/gdb/config/mips/xm-riscos.h
index 45bab301f7..f94196a146 100644
--- a/gdb/config/mips/xm-riscos.h
+++ b/gdb/config/mips/xm-riscos.h
@@ -23,3 +23,5 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 #endif
 
 #define	MEM_FNS_DECLARED
+
+#define USG 1