diff --git a/selftest/lock_test.ok b/selftest/lock_test.ok
index d7152ac..604767b 100644
--- a/selftest/lock_test.ok
+++ b/selftest/lock_test.ok
@@ -1,4 +1,4 @@
-launched first, locked by: long name
-launched second, locked by: long name
-waited, locked by: shorter
-waited more, locked by: 
+launched first, locked by: 'long name'
+launched second, locked by: 'long name'
+waited, locked by: 'shorter'
+waited more, locked by: ''
diff --git a/selftest/lock_test.sh b/selftest/lock_test.sh
index ad531eb..049c4d9 100755
--- a/selftest/lock_test.sh
+++ b/selftest/lock_test.sh
@@ -11,17 +11,17 @@
 while [ ! -f "$dir/lock_test" ]; do
   sleep .1
 done
-echo "launched first, locked by: $(cat "$dir/lock_test")"
+echo "launched first, locked by: '$(cat "$dir/lock_test")'"
 python3 ./lock_test_help.py "$dir" "$n2" &
-echo "launched second, locked by: $(cat "$dir/lock_test")"
+echo "launched second, locked by: '$(cat "$dir/lock_test")'"
 rm "$f1"
 while [ ! -f "$f1.done" ]; do
   sleep .1
 done
-echo "waited, locked by: $(cat "$dir/lock_test")"
+echo "waited, locked by: '$(cat "$dir/lock_test")'"
 rm "$f2"
 while [ ! -f "$f2.done" ]; do
   sleep .1
 done
-echo "waited more, locked by: $(cat "$dir/lock_test")"
+echo "waited more, locked by: '$(cat "$dir/lock_test")'"
 rm -rf "$dir"