diff --git a/tests/src/unit-bson.cpp b/tests/src/unit-bson.cpp
index 09321e3d5..8e2d00cbf 100644
--- a/tests/src/unit-bson.cpp
+++ b/tests/src/unit-bson.cpp
@@ -1311,6 +1311,8 @@ TEST_CASE("BSON declared document size bounds the content")
     // records the events that a SAX parser receives
     struct recorder : nlohmann::json_sax<json>
     {
+        // GCC's -Weffc++ wants the member initialized in the member initialization list
+        // NOLINTNEXTLINE(readability-redundant-member-init)
         std::string events {};
 
         bool null() override
diff --git a/tests/src/unit-regression1.cpp b/tests/src/unit-regression1.cpp
index fae261ebf..b98f2b6f3 100644
--- a/tests/src/unit-regression1.cpp
+++ b/tests/src/unit-regression1.cpp
@@ -1504,13 +1504,16 @@ TEST_CASE("regression tests 1")
         // a copied fifo_map restarts its timestamps, so a new key "k" gets
         // the timestamp of "x": the lookup does not find "k", but emplace()
         // finds "x" and inserts nothing; the pointer then continues with the
-        // member of "x", as basic_json::operator[] does
+        // member of "x", as basic_json::operator[] does. The object_t is
+        // copied explicitly: copying the my_json would build the object
+        // member by member (with fresh timestamps) when built with
+        // JSON_NO_THREAD_LOCAL.
         const my_json orig = my_json::parse(R"({"x":1})");
         const std::array<const char*, 3> pointers = {{"/k/0", "/k/a/b", "/k/-"}};
         for (const char* pointer : pointers)
         {
             CAPTURE(pointer)
-            my_json j = orig;
+            my_json j(orig.get_ref<const my_json::object_t&>());
             CHECK_THROWS_AS(j[my_json::json_pointer(pointer)], my_json::out_of_range&);
             CHECK(j.dump() == R"({"x":1})");
         }