diff --git a/bin/tests/system/resolver/tests.sh b/bin/tests/system/resolver/tests.sh
index e62dbdcae4..379b1d71e4 100755
--- a/bin/tests/system/resolver/tests.sh
+++ b/bin/tests/system/resolver/tests.sh
@@ -594,9 +594,9 @@ n=$((n+1))
 echo_i "check that '-t aaaa' in .digrc does not have unexpected side effects ($n)"
 ret=0
 echo "-t aaaa" > .digrc
-HOME="$(pwd)" dig_with_opts @10.53.0.4 . > dig.out.1.${n} || ret=1
-HOME="$(pwd)" dig_with_opts @10.53.0.4 . A > dig.out.2.${n} || ret=1
-HOME="$(pwd)" dig_with_opts @10.53.0.4 -x 127.0.0.1 > dig.out.3.${n} || ret=1
+(HOME="$(pwd)" dig_with_opts @10.53.0.4 . > dig.out.1.${n}) || ret=1
+(HOME="$(pwd)" dig_with_opts @10.53.0.4 . A > dig.out.2.${n}) || ret=1
+(HOME="$(pwd)" dig_with_opts @10.53.0.4 -x 127.0.0.1 > dig.out.3.${n}) || ret=1
 grep ';\..*IN.*AAAA$' dig.out.1.${n} > /dev/null || ret=1
 grep ';\..*IN.*A$' dig.out.2.${n} > /dev/null || ret=1
 grep 'extra type option' dig.out.2.${n} > /dev/null && ret=1