diff --git a/tests/auto/corelib/global/qrandomgenerator/tst_qrandomgenerator.cpp b/tests/auto/corelib/global/qrandomgenerator/tst_qrandomgenerator.cpp
index a3b31eda3f..9ada7352b4 100644
--- a/tests/auto/corelib/global/qrandomgenerator/tst_qrandomgenerator.cpp
+++ b/tests/auto/corelib/global/qrandomgenerator/tst_qrandomgenerator.cpp
@@ -14,7 +14,6 @@
 #  define HAVE_FALLBACK_ENGINE
 #endif
 
-#define COMMA   ,
 #define QVERIFY_3TIMES(statement)    \
     do {\
         if (!static_cast<bool>(statement))\
@@ -165,8 +164,8 @@ QT_WARNING_POP
     QRandomGenerator64 systemRng64 = *system64;
     systemRng64 = *system64;
 
-    static_assert(std::is_same<decltype(rng64.generate()) COMMA quint64>::value);
-    static_assert(std::is_same<decltype(system64->generate()) COMMA quint64>::value);
+    static_assert(std::is_same_v<decltype(rng64.generate()), quint64>);
+    static_assert(std::is_same_v<decltype(system64->generate()), quint64>);
 }
 
 void tst_QRandomGenerator::knownSequence()
@@ -895,18 +894,20 @@ void tst_QRandomGenerator::stdGenerateCanonical()
 {
     QFETCH(uint, control);
     RandomGenerator rng(control);
+    auto generate_canonical = [&rng]() {
+        return std::generate_canonical<qreal, 32>(rng);
+    };
 
     for (int i = 0; i < 4; ++i) {
         QVERIFY_3TIMES([&] {
-            qreal value = std::generate_canonical<qreal COMMA 32>(rng);
+            qreal value = generate_canonical();
             return value > 0 && value < 1 && value != RandomValueFP;
         }());
     }
 
     // and should hopefully be different from repeated calls
     for (int i = 0; i < 4; ++i)
-        QVERIFY_3TIMES(std::generate_canonical<qreal COMMA 32>(rng) !=
-                std::generate_canonical<qreal COMMA 32>(rng));
+        QVERIFY_3TIMES(generate_canonical() != generate_canonical());
 }
 
 void tst_QRandomGenerator::stdUniformRealDistribution_data()
diff --git a/tests/auto/corelib/tools/collections/tst_collections.cpp b/tests/auto/corelib/tools/collections/tst_collections.cpp
index 4b2d3b56b2..23ebf5046a 100644
--- a/tests/auto/corelib/tools/collections/tst_collections.cpp
+++ b/tests/auto/corelib/tools/collections/tst_collections.cpp
@@ -3069,9 +3069,8 @@ class T2;
 
 void tst_Collections::forwardDeclared()
 {
-#define COMMA ,
-#define TEST(type) do { \
-        using C = type; \
+#define TEST(...) do { \
+        using C = __VA_ARGS__; \
         C *x = nullptr; \
         C::iterator i; \
         C::const_iterator j; \
@@ -3080,16 +3079,15 @@ void tst_Collections::forwardDeclared()
         Q_UNUSED(j); \
     } while (false)
 
-    TEST(QHash<Key1 COMMA T1>);
-    TEST(QMap<Key1 COMMA T1>);
-    TEST(QMultiMap<Key1 COMMA T1>);
+    TEST(QHash<Key1, T1>);
+    TEST(QMap<Key1, T1>);
+    TEST(QMultiMap<Key1, T1>);
     TEST(QList<T1>);
     TEST(QVector<T1>);
     TEST(QStack<T1>);
     TEST(QQueue<T1>);
     TEST(QSet<T1>);
 #undef TEST
-#undef COMMA
 
     {
         using C = QPair<T1, T2>;