diff --git a/src/testlib/qtest.h b/src/testlib/qtest.h
index 4abba93721..ca045120d5 100644
--- a/src/testlib/qtest.h
+++ b/src/testlib/qtest.h
@@ -199,6 +199,22 @@ template<> inline char *toString(const QVariant &v)
     return qstrdup(vstring.constData());
 }
 
+template <typename T1, typename T2>
+inline char *toString(const QPair<T1, T2> &pair)
+{
+    const QScopedArrayPointer<char> first(toString(pair.first));
+    const QScopedArrayPointer<char> second(toString(pair.second));
+    return toString(QString::asprintf("QPair(%s,%s)", first.data(), second.data()));
+}
+
+template <typename T1, typename T2>
+inline char *toString(const std::pair<T1, T2> &pair)
+{
+    const QScopedArrayPointer<char> first(toString(pair.first));
+    const QScopedArrayPointer<char> second(toString(pair.second));
+    return toString(QString::asprintf("std::pair(%s,%s)", first.data(), second.data()));
+}
+
 inline char *toString(std::nullptr_t)
 {
     return toString(QLatin1String("nullptr"));
diff --git a/src/testlib/qtestcase.h b/src/testlib/qtestcase.h
index fafc0eb7d6..b738043cb7 100644
--- a/src/testlib/qtestcase.h
+++ b/src/testlib/qtestcase.h
@@ -260,20 +260,10 @@ namespace QTest
     }
 
     template <typename T1, typename T2>
-    inline char *toString(const QPair<T1, T2> &pair)
-    {
-        const QScopedArrayPointer<char> first(toString(pair.first));
-        const QScopedArrayPointer<char> second(toString(pair.second));
-        return toString(QString::asprintf("QPair(%s,%s)", first.data(), second.data()));
-    }
+    inline char *toString(const QPair<T1, T2> &pair);
 
     template <typename T1, typename T2>
-    inline char *toString(const std::pair<T1, T2> &pair)
-    {
-        const QScopedArrayPointer<char> first(toString(pair.first));
-        const QScopedArrayPointer<char> second(toString(pair.second));
-        return toString(QString::asprintf("std::pair(%s,%s)", first.data(), second.data()));
-    }
+    inline char *toString(const std::pair<T1, T2> &pair);
 
     Q_TESTLIB_EXPORT char *toHexRepresentation(const char *ba, int length);
     Q_TESTLIB_EXPORT char *toPrettyCString(const char *unicode, int length);