diff --git a/config.guess b/config.guess
index 9b6b0c6..e31f37d 100755
--- a/config.guess
+++ b/config.guess
@@ -748,7 +748,7 @@ EOF
     news*:NEWS-OS:*:6*)
 	echo mips-sony-newsos6
 	exit 0 ;;
-    R3000:*System_V*:*:* | R4000:UNIX_SYSV:*:*)
+    R3000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R4000:UNIX_SV:*:*)
 	if [ -d /usr/nec ]; then
 	        echo mips-nec-sysv${UNAME_RELEASE}
 	else