diff --git a/tools/regression/usr.bin/xargs/regress.R.out b/tools/regression/usr.bin/xargs/regress.R.out
new file mode 100644
index 000000000000..6fe947f0d9e4
--- /dev/null
+++ b/tools/regression/usr.bin/xargs/regress.R.out
@@ -0,0 +1,4 @@
+The quick brown % % %% % %
+The fox jumped % % %% % %
+The over the lazy % % %% % %
+The dog % % %% % %
diff --git a/tools/regression/usr.bin/xargs/regress.sh b/tools/regression/usr.bin/xargs/regress.sh
index 836b10ef3617..5c83b5caced7 100644
--- a/tools/regression/usr.bin/xargs/regress.sh
+++ b/tools/regression/usr.bin/xargs/regress.sh
@@ -9,7 +9,7 @@ cd $TESTDIR
 
 STATUS=0
 
-for test in normal I J L; do
+for test in normal I J L R; do
   echo "Running test $test"
   case "$test" in
   normal)
@@ -24,6 +24,9 @@ for test in normal I J L; do
   L)
     xargs -L3 echo < regress.in | diff -u regress.$test.out -
     ;;
+  R)
+    xargs -I% -R1 echo The % % % %% % % < regress.in | diff -u regress.$test.out -
+    ;;
   esac
   if [ $? -eq 0 ]; then
     echo "PASS: Test $test detected no regression, output matches."