diff --git a/src/corelib/text/qstring.h b/src/corelib/text/qstring.h
index f3c7ce10266..1ab4ed97874 100644
--- a/src/corelib/text/qstring.h
+++ b/src/corelib/text/qstring.h
@@ -1493,9 +1493,7 @@ inline QString operator"" _qs(const char16_t *str, size_t size) noexcept
 
 QT_END_NAMESPACE
 
-#if defined(QT_USE_FAST_OPERATOR_PLUS) || defined(QT_USE_QSTRINGBUILDER)
 #include <QtCore/qstringbuilder.h>
-#endif
 
 #ifdef Q_L1S_VIEW_IS_PRIMARY
 #    undef Q_L1S_VIEW_IS_PRIMARY
diff --git a/src/corelib/text/qstringconverter.h b/src/corelib/text/qstringconverter.h
index 373c1ad1e91..e12516966a8 100644
--- a/src/corelib/text/qstringconverter.h
+++ b/src/corelib/text/qstringconverter.h
@@ -13,9 +13,7 @@
 
 #include <QtCore/qstringconverter_base.h>
 #include <QtCore/qstring.h>
-#if defined(QT_USE_FAST_OPERATOR_PLUS) || defined(QT_USE_QSTRINGBUILDER)
 #include <QtCore/qstringbuilder.h>
-#endif
 
 QT_BEGIN_NAMESPACE