diff --git a/test/units/testsuite-23.sh b/test/units/testsuite-23.sh
index a6b8da34c9..34899070f1 100755
--- a/test/units/testsuite-23.sh
+++ b/test/units/testsuite-23.sh
@@ -46,7 +46,7 @@ handle_signal() {
 wait_harder() {
     local pid="${1:?}"
 
-    while kill -0 "$pid"; do
+    while kill -0 "$pid" &>/dev/null; do
         wait "$pid" || :
     done