diff --git a/scripts/mkqtdecl_common/common.conf b/scripts/mkqtdecl_common/common.conf
index 378d6e1c6..1a07a185b 100644
--- a/scripts/mkqtdecl_common/common.conf
+++ b/scripts/mkqtdecl_common/common.conf
@@ -71,6 +71,8 @@ def add_native_impl_QObject_findChild()
 
 #if QT_VERSION < 0x50000
 
+#include <QRegExp>
+
   QObject *find_child_impl (QObject *object, const QString &name) 
   { 
     return object->findChild<QObject *> (name); 
@@ -79,7 +81,7 @@ def add_native_impl_QObject_findChild()
   { 
     return object->findChildren<QObject *> (name); 
   }
-  QList<QObject *> find_children_impl2 (QObject *object, const QRegularExpression &re)
+  QList<QObject *> find_children_impl2 (QObject *object, const QRegExp &re)
   { 
     return object->findChildren<QObject *> (re); 
   }
diff --git a/src/gsiqt/qt4/QtCore/gsiDeclQObject.cc b/src/gsiqt/qt4/QtCore/gsiDeclQObject.cc
index 2a9929f86..2ab3add1e 100644
--- a/src/gsiqt/qt4/QtCore/gsiDeclQObject.cc
+++ b/src/gsiqt/qt4/QtCore/gsiDeclQObject.cc
@@ -54,6 +54,8 @@ static void _call_smo (const qt_gsi::GenericStaticMethod *, gsi::SerialArgs &, g
 
 #if QT_VERSION < 0x50000
 
+#include <QRegExp>
+
   QObject *find_child_impl (QObject *object, const QString &name) 
   { 
     return object->findChild<QObject *> (name); 
@@ -62,7 +64,7 @@ static void _call_smo (const qt_gsi::GenericStaticMethod *, gsi::SerialArgs &, g
   { 
     return object->findChildren<QObject *> (name); 
   }
-  QList<QObject *> find_children_impl2 (QObject *object, const QRegularExpression &re)
+  QList<QObject *> find_children_impl2 (QObject *object, const QRegExp &re)
   { 
     return object->findChildren<QObject *> (re); 
   }
diff --git a/src/gsiqt/qt5/QtCore/gsiDeclQObject.cc b/src/gsiqt/qt5/QtCore/gsiDeclQObject.cc
index aa5d7c29d..70ccedc94 100644
--- a/src/gsiqt/qt5/QtCore/gsiDeclQObject.cc
+++ b/src/gsiqt/qt5/QtCore/gsiDeclQObject.cc
@@ -55,6 +55,8 @@ static void _call_smo (const qt_gsi::GenericStaticMethod *, gsi::SerialArgs &, g
 
 #if QT_VERSION < 0x50000
 
+#include <QRegExp>
+
   QObject *find_child_impl (QObject *object, const QString &name) 
   { 
     return object->findChild<QObject *> (name); 
@@ -63,7 +65,7 @@ static void _call_smo (const qt_gsi::GenericStaticMethod *, gsi::SerialArgs &, g
   { 
     return object->findChildren<QObject *> (name); 
   }
-  QList<QObject *> find_children_impl2 (QObject *object, const QRegularExpression &re)
+  QList<QObject *> find_children_impl2 (QObject *object, const QRegExp &re)
   { 
     return object->findChildren<QObject *> (re); 
   }
diff --git a/src/gsiqt/qt6/QtCore/gsiDeclQObject.cc b/src/gsiqt/qt6/QtCore/gsiDeclQObject.cc
index aafe61ded..f4a89d144 100644
--- a/src/gsiqt/qt6/QtCore/gsiDeclQObject.cc
+++ b/src/gsiqt/qt6/QtCore/gsiDeclQObject.cc
@@ -55,6 +55,8 @@ static void _call_smo (const qt_gsi::GenericStaticMethod *, gsi::SerialArgs &, g
 
 #if QT_VERSION < 0x50000
 
+#include <QRegExp>
+
   QObject *find_child_impl (QObject *object, const QString &name) 
   { 
     return object->findChild<QObject *> (name); 
@@ -63,7 +65,7 @@ static void _call_smo (const qt_gsi::GenericStaticMethod *, gsi::SerialArgs &, g
   { 
     return object->findChildren<QObject *> (name); 
   }
-  QList<QObject *> find_children_impl2 (QObject *object, const QRegularExpression &re)
+  QList<QObject *> find_children_impl2 (QObject *object, const QRegExp &re)
   { 
     return object->findChildren<QObject *> (re); 
   }