diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh
index 44f4e703deb9..e1945901fd20 100755
--- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh
+++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh
@@ -17,6 +17,7 @@ if ! command -v killall >/dev/null 2>&1; then
 fi
 
 nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages)
+trap 'echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages' EXIT INT TERM
 
 fault_limit_file=limit_in_bytes
 reservation_limit_file=rsvd.limit_in_bytes
@@ -70,7 +71,6 @@ function cleanup() {
   if [[ -e $cgroup_path/hugetlb_cgroup_test2 ]]; then
     rmdir $cgroup_path/hugetlb_cgroup_test2
   fi
-  echo 0 >/proc/sys/vm/nr_hugepages
   echo CLEANUP DONE
 }
 
@@ -599,4 +599,3 @@ if [[ $do_umount ]]; then
   rmdir $cgroup_path
 fi
 
-echo "$nr_hugepgs" > /proc/sys/vm/nr_hugepages