diff --git a/gcc/config.sub b/gcc/config.sub
index 294a23eb69f2786892ce2d1c86840564a27a6f07..fc1c5c46619e521e32c9be18673027bd41682973 100755
--- a/gcc/config.sub
+++ b/gcc/config.sub
@@ -534,6 +534,9 @@ case $os in
 	-svr4)
 		os=-sysv4
 		;;
+	-sysvr4)
+		os=-sysv4
+		;;
 	-svr3)
 		os=-sysv3
 		;;