diff --git a/tests/base/04-test-run_nginx.sh b/tests/base/04-test-run_nginx.sh
index 92f22e2..bdeb07a 100755
--- a/tests/base/04-test-run_nginx.sh
+++ b/tests/base/04-test-run_nginx.sh
@@ -66,11 +66,12 @@ ndid="$( docker_run "${CONTAINER}" "-v ${DOC_ROOT_HOST}:${DOC_ROOT_CONT} -v ${CO
 run "sleep 10"
 
 # Check PHP connectivity
-if ! run "curl -q http://localhost:${WWW_PORT}/index.php 2>&1 | grep '${FINDME}'"; then
+if ! run "curl -q -4 http://127.0.0.1:${WWW_PORT}/index.php 2>&1 | grep '${FINDME}'"; then
 
 	# Info
 	run "netstat -tuln"
-	run "curl http://localhost:${WWW_PORT}/index.php" || true
+	run "curl -4 http://127.0.0.1:${WWW_PORT}/index.php" || true
+	run "curl -6 http://127.0.0.1:${WWW_PORT}/index.php" || true
 	run "docker ps --no-trunc"
 	docker_exec "${ndid}" "nginx -t"
 
diff --git a/tests/prod/05-test-mount-custom_ini.sh b/tests/prod/05-test-mount-custom_ini.sh
index 516c0c4..d514ed3 100755
--- a/tests/prod/05-test-mount-custom_ini.sh
+++ b/tests/prod/05-test-mount-custom_ini.sh
@@ -82,7 +82,7 @@ if ! run "docker logs ${did} | grep 'post.ini'"; then
 fi
 
 # Check PHP connectivity
-if ! run "curl -q localhost:${WWW_PORT}/index.php >/dev/null 2>&1"; then
+if ! run "curl -q -4 127.0.0.1:${WWW_PORT}/index.php >/dev/null 2>&1"; then
 	docker_logs "${ndid}" || true
 	docker_logs "${did}"  || true
 	docker_stop "${ndid}" || true
@@ -109,7 +109,7 @@ if ! docker_exec "${did}" "php -r \"echo ini_get('post_max_size');\" | grep '17M
 fi
 
 # Check modified php.ini
-if ! run "curl -q localhost:${WWW_PORT}/index.php 2>/dev/null | grep post_max_size | grep '17M'"; then
+if ! run "curl -q -4 127.0.0.1:${WWW_PORT}/index.php 2>/dev/null | grep post_max_size | grep '17M'"; then
 	docker_exec "${did}" "php -r \"echo ini_get('post_max_size');\""
 	docker_logs "${ndid}" || true
 	docker_logs "${did}"  || true