diff --git a/tests/src/unit-class_parser.cpp b/tests/src/unit-class_parser.cpp
index bba7b8081..14c23c4ef 100644
--- a/tests/src/unit-class_parser.cpp
+++ b/tests/src/unit-class_parser.cpp
@@ -11,6 +11,7 @@
 #define JSON_TESTS_PRIVATE
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <valarray>
 
diff --git a/tests/src/unit-deserialization.cpp b/tests/src/unit-deserialization.cpp
index 5a62e9bc6..1c7a73d3a 100644
--- a/tests/src/unit-deserialization.cpp
+++ b/tests/src/unit-deserialization.cpp
@@ -11,6 +11,7 @@
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <iostream>
 #include <iterator>
diff --git a/tests/src/unit-element_access2.cpp b/tests/src/unit-element_access2.cpp
index d164cf99f..8681bd380 100644
--- a/tests/src/unit-element_access2.cpp
+++ b/tests/src/unit-element_access2.cpp
@@ -10,6 +10,7 @@
 #include "doctest_compatibility.h"
 
 #include <nlohmann/json.hpp>
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 TEST_CASE_TEMPLATE("element access 2", Json, nlohmann::json, nlohmann::ordered_json)
 {
diff --git a/tests/src/unit-json_patch.cpp b/tests/src/unit-json_patch.cpp
index 20a77714b..22c347103 100644
--- a/tests/src/unit-json_patch.cpp
+++ b/tests/src/unit-json_patch.cpp
@@ -10,6 +10,7 @@
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <fstream>
 #include "make_test_data_available.hpp"
diff --git a/tests/src/unit-json_pointer.cpp b/tests/src/unit-json_pointer.cpp
index 977af9f6e..ab0b06121 100644
--- a/tests/src/unit-json_pointer.cpp
+++ b/tests/src/unit-json_pointer.cpp
@@ -11,6 +11,7 @@
 #define JSON_TESTS_PRIVATE
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <sstream>
 
diff --git a/tests/src/unit-merge_patch.cpp b/tests/src/unit-merge_patch.cpp
index e3b759b9c..1bb8ff139 100644
--- a/tests/src/unit-merge_patch.cpp
+++ b/tests/src/unit-merge_patch.cpp
@@ -10,6 +10,7 @@
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 TEST_CASE("JSON Merge Patch")
 {
diff --git a/tests/src/unit-msgpack.cpp b/tests/src/unit-msgpack.cpp
index e848dd202..796227a93 100644
--- a/tests/src/unit-msgpack.cpp
+++ b/tests/src/unit-msgpack.cpp
@@ -10,6 +10,7 @@
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <fstream>
 #include <sstream>
diff --git a/tests/src/unit-readme.cpp b/tests/src/unit-readme.cpp
index 457680f7a..9b8c7f5ef 100644
--- a/tests/src/unit-readme.cpp
+++ b/tests/src/unit-readme.cpp
@@ -10,6 +10,7 @@
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <deque>
 #include <forward_list>
diff --git a/tests/src/unit-regression1.cpp b/tests/src/unit-regression1.cpp
index a4e82134a..1fe603809 100644
--- a/tests/src/unit-regression1.cpp
+++ b/tests/src/unit-regression1.cpp
@@ -14,6 +14,7 @@
 #define JSON_TESTS_PRIVATE
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <fstream>
 #include <sstream>
diff --git a/tests/src/unit-regression2.cpp b/tests/src/unit-regression2.cpp
index d9f1258db..6c21a350f 100644
--- a/tests/src/unit-regression2.cpp
+++ b/tests/src/unit-regression2.cpp
@@ -22,6 +22,7 @@
 #include <nlohmann/json.hpp>
 using json = nlohmann::json;
 using ordered_json = nlohmann::ordered_json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <cstdio>
 #include <list>
diff --git a/tests/src/unit-udt.cpp b/tests/src/unit-udt.cpp
index 0b1d1472f..2654fe8a4 100644
--- a/tests/src/unit-udt.cpp
+++ b/tests/src/unit-udt.cpp
@@ -14,6 +14,7 @@ DOCTEST_GCC_SUPPRESS_WARNING("-Wnoexcept")
 
 #include <nlohmann/json.hpp>
 using nlohmann::json;
+using namespace nlohmann::literals; // NOLINT(google-build-using-namespace)
 
 #include <map>
 #include <memory>