diff --git a/src/testlib/qtestcase.qdoc b/src/testlib/qtestcase.qdoc
index 0062814ea1e..38b4883f94a 100644
--- a/src/testlib/qtestcase.qdoc
+++ b/src/testlib/qtestcase.qdoc
@@ -1231,7 +1231,7 @@
     \sa QTest::keyClick()
 */
 
-/*! \fn void QTest::mousePress(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mousePress(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier, QPoint pos = QPoint(), int delay=-1)
 
     Simulates pressing a mouse \a button with an optional \a modifier
     on a \a widget.  The position is defined by \a pos; the default
@@ -1242,7 +1242,7 @@
     \sa QTest::mouseRelease(), QTest::mouseClick()
 */
 
-/*! \fn void QTest::mousePress(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mousePress(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey, QPoint pos = QPoint(), int delay=-1)
     \overload
     \since 5.0
 
@@ -1255,7 +1255,7 @@
     \sa QTest::mouseRelease(), QTest::mouseClick()
 */
 
-/*! \fn void QTest::mouseRelease(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mouseRelease(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier, QPoint pos = QPoint(), int delay=-1)
 
     Simulates releasing a mouse \a button with an optional \a modifier
     on a \a widget.  The position of the release is defined by \a pos;
@@ -1275,7 +1275,7 @@
     \sa QTest::mousePress(), QTest::mouseClick()
 */
 
-/*! \fn void QTest::mouseRelease(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mouseRelease(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey, QPoint pos = QPoint(), int delay=-1)
     \overload
     \since 5.0
 
@@ -1297,7 +1297,7 @@
     \sa QTest::mousePress(), QTest::mouseClick()
 */
 
-/*! \fn void QTest::mouseClick(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mouseClick(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier, QPoint pos = QPoint(), int delay=-1)
 
     Simulates clicking a mouse \a button with an optional \a modifier
     on a \a widget.  The position of the click is defined by \a pos;
@@ -1308,7 +1308,7 @@
     \sa QTest::mousePress(), QTest::mouseRelease()
 */
 
-/*! \fn void QTest::mouseClick(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mouseClick(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey, QPoint pos = QPoint(), int delay=-1)
     \overload
     \since 5.0
 
@@ -1321,7 +1321,7 @@
     \sa QTest::mousePress(), QTest::mouseRelease()
 */
 
-/*! \fn void QTest::mouseDClick(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mouseDClick(QWidget *widget, Qt::MouseButton button, Qt::KeyboardModifiers modifier, QPoint pos = QPoint(), int delay=-1)
 
     Simulates double clicking a mouse \a button with an optional \a
     modifier on a \a widget.  The position of the click is defined by
@@ -1332,7 +1332,7 @@
     \sa QTest::mouseClick()
 */
 
-/*! \fn void QTest::mouseDClick(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTest::mouseDClick(QWindow *window, Qt::MouseButton button, Qt::KeyboardModifiers stateKey, QPoint pos = QPoint(), int delay=-1)
     \overload
     \since 5.0
 
diff --git a/src/testlib/qtestevent.qdoc b/src/testlib/qtestevent.qdoc
index f71b99f8d73..a7af6d5592b 100644
--- a/src/testlib/qtestevent.qdoc
+++ b/src/testlib/qtestevent.qdoc
@@ -118,25 +118,25 @@
     For an example, please read the \l QTestEventList class documentation.
 */
 
-/*! \fn void QTestEventList::addMousePress(Qt::MouseButton button, Qt::KeyboardModifiers modifiers = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTestEventList::addMousePress(Qt::MouseButton button, Qt::KeyboardModifiers modifiers, QPoint pos = QPoint(), int delay=-1)
 
     Add a mouse press to the list. The event will press the \a button with optional \a modifiers at the position \a pos with an optional \a delay. The default position is the center of the widget.
 
     \sa QTest::mousePress()
 */
-/*! \fn void QTestEventList::addMouseRelease(Qt::MouseButton button, Qt::KeyboardModifiers modifiers = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTestEventList::addMouseRelease(Qt::MouseButton button, Qt::KeyboardModifiers modifiers, QPoint pos = QPoint(), int delay=-1)
 
     Add a mouse release to the list. The event will release the \a button with optional \a modifiers at the position \a pos with an optional \a delay. The default position is the center of the widget.
 
     \sa QTest::mouseRelease()
 */
-/*! \fn void QTestEventList::addMouseClick(Qt::MouseButton button, Qt::KeyboardModifiers modifiers = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTestEventList::addMouseClick(Qt::MouseButton button, Qt::KeyboardModifiers modifiers, QPoint pos = QPoint(), int delay=-1)
 
     Add a mouse click to the list. The event will click the \a button with optional \a modifiers at the position \a pos with an optional \a delay. The default position is the center of the widget.
 
     \sa QTest::mouseClick()
 */
-/*! \fn void QTestEventList::addMouseDClick(Qt::MouseButton button, Qt::KeyboardModifiers modifiers = 0, QPoint pos = QPoint(), int delay=-1)
+/*! \fn void QTestEventList::addMouseDClick(Qt::MouseButton button, Qt::KeyboardModifiers modifiers, QPoint pos = QPoint(), int delay=-1)
 
     Add a double mouse click to the list. The event will double click the \a button with optional \a modifiers at the position \a pos with an optional \a delay. The default position is the center of the widget.
 
diff --git a/src/widgets/graphicsview/qgraphicsgridlayout.cpp b/src/widgets/graphicsview/qgraphicsgridlayout.cpp
index 139ccf3af8c..e4599d20bbc 100644
--- a/src/widgets/graphicsview/qgraphicsgridlayout.cpp
+++ b/src/widgets/graphicsview/qgraphicsgridlayout.cpp
@@ -146,7 +146,7 @@ void QGraphicsGridLayout::addItem(QGraphicsLayoutItem *item, int row, int column
 }
 
 /*!
-    \fn QGraphicsGridLayout::addItem(QGraphicsLayoutItem *item, int row, int column, Qt::Alignment alignment = 0)
+    \fn QGraphicsGridLayout::addItem(QGraphicsLayoutItem *item, int row, int column, Qt::Alignment alignment)
 
     Adds \a item to the grid on \a row and \a column. You can specify
     an optional \a alignment for \a item.