diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index fdbb31050..53b3885c7 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -1362,7 +1362,7 @@ do_run_test_once() {
 
     if [ -n "$PXY_CMD" ]; then
         kill $PXY_PID >/dev/null 2>&1
-        wait $PXY_PID
+        wait $PXY_PID >> $PXY_OUT 2>&1
     fi
 }