diff --git a/test/message/flat_map_test.cpp b/test/message/flat_map_test.cpp
new file mode 100644
index 0000000..8c18fd5
--- /dev/null
+++ b/test/message/flat_map_test.cpp
@@ -0,0 +1,53 @@
+#include <systemd/sd-bus-protocol.h>
+
+#include <sdbusplus/message.hpp>
+#include <sdbusplus/test/sdbus_mock.hpp>
+
+#include <flat_map>
+#include <string>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+namespace
+{
+
+using testing::DoAll;
+using testing::Return;
+using testing::StrEq;
+
+ACTION_TEMPLATE(SetReadValue, HAS_1_TEMPLATE_PARAMS(typename, T),
+                AND_1_VALUE_PARAMS(value))
+{
+    *static_cast<T*>(arg2) = value;
+}
+
+class FlatMapTest : public testing::Test
+{
+  protected:
+    testing::StrictMock<sdbusplus::SdBusMock> mock;
+
+    void SetUp() override
+    {
+        EXPECT_CALL(mock, sd_bus_message_new_method_call(testing::_, testing::_,
+                                                         nullptr, nullptr,
+                                                         nullptr, nullptr))
+            .WillRepeatedly(Return(0));
+    }
+
+    sdbusplus::message_t new_message()
+    {
+        return sdbusplus::get_mocked_new(&mock).new_method_call(
+            nullptr, nullptr, nullptr, nullptr);
+    }
+};
+
+// Test that flat_map compiles with the read/append functions
+TEST_F(FlatMapTest, CompileTest)
+{
+    std::flat_map<std::string, int> fmap{{"key1", 100}, {"key2", 200}};
+    // This test just verifies that the code compiles
+    SUCCEED();
+}
+
+} // namespace