diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 958c368..f015118 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -628,6 +628,10 @@
     # as it provides timing info that's useful to debug failures
     if [ -z "$PXY_CMD" ] && [ "$DTLS" -eq 1 ]; then
         PXY_CMD="$P_PXY"
+        case " $SRV_CMD " in
+            *' server_addr=::1 '*)
+                PXY_CMD="$PXY_CMD server_addr=::1 listen_addr=::1";;
+        esac
     fi
 
     # fix client port