diff --git a/usr.bin/du/tests/du_test.sh b/usr.bin/du/tests/du_test.sh
--- a/usr.bin/du/tests/du_test.sh
+++ b/usr.bin/du/tests/du_test.sh
@@ -45,17 +45,25 @@
 H_flag_body()
 {
 	local paths1='testdir/A/B testdir/A testdir/C testdir'
-	local paths2='testdir/A/B testdir/A testdir/C testdir'
+	local paths2='testdir/C/B testdir/C'
 	local lineprefix="^[0-9]+$(printf "\t")"
-	local sep="\n${lineprefix}"
+	local sep="\$\n${lineprefix}"
 
 	atf_check mkdir testdir
 	atf_check -x "cd testdir && mkdir A && touch A/B && ln -s A C"
 
 	atf_check -o save:du.out du -aAH testdir
-	atf_check egrep -q "${lineprefix}$(echo $paths1 | sed -e "s/ /$sep/g")" du.out
+	atf_check egrep -q "${lineprefix}$(echo $paths1 | sed -e "s/ /$sep/g")$" du.out
+	# Check that the output doesn't contain any lines (i.e. paths) that we
+	# did not expect it to contain from $paths1.
+	atf_check -s exit:1 egrep -vq "${lineprefix}$(echo $paths1 | sed -e "s/ /$sep/g")$" du.out
+
 	atf_check -o save:du_C.out du -aAH testdir/C
-	atf_check egrep -q "${lineprefix}$(echo $paths2 | sed -e "s/ /$sep/g")" du_C.out
+	atf_check egrep -q "${lineprefix}$(echo $paths2 | sed -e "s/ /$sep/g")$" du_C.out
+
+	# Check that the output doesn't contain any lines (i.e. paths) that we
+	# did not expect it to contain from $paths2.
+	atf_check -s exit:1 egrep -vq "${lineprefix}$(echo $paths2 | sed -e "s/ /$sep/g")$" du_C.out
 }
 
 atf_test_case I_flag