diff --git a/test/mock_network_manager.hpp b/test/mock_network_manager.hpp
index fde3bbd..337af88 100644
--- a/test/mock_network_manager.hpp
+++ b/test/mock_network_manager.hpp
@@ -1,6 +1,7 @@
 #pragma once
 #include "mock_ethernet_interface.hpp"
 #include "network_manager.hpp"
+#include "util.hpp"
 
 #include <gmock/gmock.h>
 
diff --git a/test/test_util.cpp b/test/test_util.cpp
index 4a50a26..dbf0a27 100644
--- a/test/test_util.cpp
+++ b/test/test_util.cpp
@@ -230,7 +230,7 @@
 TEST(IgnoredInterfaces, NotEmpty)
 {
     using ::testing::ContainerEq;
-    std::set<std::string_view> expected = {"eth0"};
+    std::unordered_set<std::string_view> expected = {"eth0"};
     auto ret = internal::parseInterfaces("eth0");
     EXPECT_THAT(ret, ContainerEq(expected));