diff --git a/src/corelib/animation/qpropertyanimation.cpp b/src/corelib/animation/qpropertyanimation.cpp
index d461668dbb3..2247c95201c 100644
--- a/src/corelib/animation/qpropertyanimation.cpp
+++ b/src/corelib/animation/qpropertyanimation.cpp
@@ -58,6 +58,9 @@
 
 QT_BEGIN_NAMESPACE
 
+QPropertyAnimationPrivate::~QPropertyAnimationPrivate()
+    = default;
+
 void QPropertyAnimationPrivate::updateMetaProperty()
 {
     const QObject *target = targetObject.valueBypassingBindings();
diff --git a/src/corelib/animation/qpropertyanimation_p.h b/src/corelib/animation/qpropertyanimation_p.h
index 9e41d4dc6d6..ef5534cd9c3 100644
--- a/src/corelib/animation/qpropertyanimation_p.h
+++ b/src/corelib/animation/qpropertyanimation_p.h
@@ -29,6 +29,7 @@ class QPropertyAnimationPrivate : public QVariantAnimationPrivate
    Q_DECLARE_PUBLIC(QPropertyAnimation)
 public:
     QPropertyAnimationPrivate() : propertyType(0), propertyIndex(-1) { }
+    ~QPropertyAnimationPrivate() override;
 
     void setTargetObjectForwarder(QObject *target) { q_func()->setTargetObject(target); }
     Q_OBJECT_COMPAT_PROPERTY_WITH_ARGS(QPropertyAnimationPrivate, QObject *, targetObject,
diff --git a/src/corelib/animation/qvariantanimation.cpp b/src/corelib/animation/qvariantanimation.cpp
index b4d47aae8f8..d268ab185ac 100644
--- a/src/corelib/animation/qvariantanimation.cpp
+++ b/src/corelib/animation/qvariantanimation.cpp
@@ -152,6 +152,9 @@ template<> Q_INLINE_TEMPLATE QLineF _q_interpolate(const QLineF &f, const QLineF
 QVariantAnimationPrivate::QVariantAnimationPrivate() : duration(250), interpolator(&defaultInterpolator)
 { }
 
+QVariantAnimationPrivate::~QVariantAnimationPrivate()
+    = default;
+
 void QVariantAnimationPrivate::convertValues(int t)
 {
     auto type = QMetaType(t);
diff --git a/src/corelib/animation/qvariantanimation_p.h b/src/corelib/animation/qvariantanimation_p.h
index 85f996f7bdd..0ac238a882b 100644
--- a/src/corelib/animation/qvariantanimation_p.h
+++ b/src/corelib/animation/qvariantanimation_p.h
@@ -34,6 +34,7 @@ class QVariantAnimationPrivate : public QAbstractAnimationPrivate
 public:
 
     QVariantAnimationPrivate();
+    ~QVariantAnimationPrivate() override;
 
     static QVariantAnimationPrivate *get(QVariantAnimation *q)
     {
diff --git a/src/corelib/io/qabstractfileengine.cpp b/src/corelib/io/qabstractfileengine.cpp
index 70e68be21c1..4c78e1b1bf2 100644
--- a/src/corelib/io/qabstractfileengine.cpp
+++ b/src/corelib/io/qabstractfileengine.cpp
@@ -32,6 +32,9 @@ static QString appendSlashIfNeeded(const QString &path)
     return path;
 }
 
+QAbstractFileEnginePrivate::~QAbstractFileEnginePrivate()
+    = default;
+
 /*!
     \class QAbstractFileEngineHandler
     \inmodule QtCore
diff --git a/src/corelib/io/qabstractfileengine_p.h b/src/corelib/io/qabstractfileengine_p.h
index 5e6232af71a..2a480db9552 100644
--- a/src/corelib/io/qabstractfileengine_p.h
+++ b/src/corelib/io/qabstractfileengine_p.h
@@ -246,7 +246,7 @@ public:
         : fileError(QFile::UnspecifiedError)
     {
     }
-    inline virtual ~QAbstractFileEnginePrivate() { }
+    virtual ~QAbstractFileEnginePrivate();
 
     QFile::FileError fileError;
     QString errorString;
diff --git a/src/corelib/itemmodels/qidentityproxymodel.cpp b/src/corelib/itemmodels/qidentityproxymodel.cpp
index da4bc097cb4..069878e1123 100644
--- a/src/corelib/itemmodels/qidentityproxymodel.cpp
+++ b/src/corelib/itemmodels/qidentityproxymodel.cpp
@@ -8,6 +8,9 @@
 
 QT_BEGIN_NAMESPACE
 
+QIdentityProxyModelPrivate::~QIdentityProxyModelPrivate()
+    = default;
+
 /*!
     \since 4.8
     \class QIdentityProxyModel
diff --git a/src/corelib/itemmodels/qidentityproxymodel_p.h b/src/corelib/itemmodels/qidentityproxymodel_p.h
index bb63dd3cd2e..9762110de21 100644
--- a/src/corelib/itemmodels/qidentityproxymodel_p.h
+++ b/src/corelib/itemmodels/qidentityproxymodel_p.h
@@ -29,6 +29,7 @@ public:
     QIdentityProxyModelPrivate()
     {
     }
+    ~QIdentityProxyModelPrivate() override;
 
     QList<QPersistentModelIndex> layoutChangePersistentIndexes;
     QModelIndexList proxyIndexes;
diff --git a/src/corelib/itemmodels/qitemselectionmodel.cpp b/src/corelib/itemmodels/qitemselectionmodel.cpp
index 6df60aaf61b..7175c0d3bbe 100644
--- a/src/corelib/itemmodels/qitemselectionmodel.cpp
+++ b/src/corelib/itemmodels/qitemselectionmodel.cpp
@@ -549,6 +549,8 @@ void QItemSelection::split(const QItemSelectionRange &range,
     }
 }
 
+QItemSelectionModelPrivate::~QItemSelectionModelPrivate()
+    = default;
 
 void QItemSelectionModelPrivate::initModel(QAbstractItemModel *m)
 {
diff --git a/src/corelib/itemmodels/qitemselectionmodel_p.h b/src/corelib/itemmodels/qitemselectionmodel_p.h
index 3d9cd801f7f..6f905c846c7 100644
--- a/src/corelib/itemmodels/qitemselectionmodel_p.h
+++ b/src/corelib/itemmodels/qitemselectionmodel_p.h
@@ -31,6 +31,7 @@ public:
     QItemSelectionModelPrivate()
       : currentCommand(QItemSelectionModel::NoUpdate),
         tableSelected(false), tableColCount(0), tableRowCount(0) {}
+    ~QItemSelectionModelPrivate() override;
 
     QItemSelection expandSelection(const QItemSelection &selection,
                                    QItemSelectionModel::SelectionFlags command) const;
diff --git a/src/corelib/kernel/qeventloop.cpp b/src/corelib/kernel/qeventloop.cpp
index e314a17ff80..2d401e7a425 100644
--- a/src/corelib/kernel/qeventloop.cpp
+++ b/src/corelib/kernel/qeventloop.cpp
@@ -14,6 +14,9 @@
 
 QT_BEGIN_NAMESPACE
 
+QEventLoopPrivate::~QEventLoopPrivate()
+    = default;
+
 /*!
     \class QEventLoop
     \inmodule QtCore
diff --git a/src/corelib/kernel/qeventloop_p.h b/src/corelib/kernel/qeventloop_p.h
index 1fcb7a8b811..cb00fba41fc 100644
--- a/src/corelib/kernel/qeventloop_p.h
+++ b/src/corelib/kernel/qeventloop_p.h
@@ -30,6 +30,7 @@ public:
         returnCode.storeRelaxed(-1);
         exit.storeRelaxed(true);
     }
+    ~QEventLoopPrivate() override;
 
     QAtomicInt quitLockRef;
 
diff --git a/src/corelib/kernel/qtimer.cpp b/src/corelib/kernel/qtimer.cpp
index 420167c0157..9e4dc7afb40 100644
--- a/src/corelib/kernel/qtimer.cpp
+++ b/src/corelib/kernel/qtimer.cpp
@@ -19,6 +19,9 @@ using namespace std::chrono_literals;
 
 QT_BEGIN_NAMESPACE
 
+QTimerPrivate::~QTimerPrivate()
+    = default;
+
 /*!
     \class QTimer
     \inmodule QtCore
diff --git a/src/corelib/kernel/qtimer_p.h b/src/corelib/kernel/qtimer_p.h
index 9347f6c241c..91d6234665f 100644
--- a/src/corelib/kernel/qtimer_p.h
+++ b/src/corelib/kernel/qtimer_p.h
@@ -35,6 +35,7 @@ public:
     {
         intervalDuration.notify();
     }
+    ~QTimerPrivate() override;
 
     static constexpr int INV_TIMER = -1; // invalid timer id
 
diff --git a/src/corelib/mimetypes/qmimetypeparser.cpp b/src/corelib/mimetypes/qmimetypeparser.cpp
index c3fb80f3b94..1f5a86d11bb 100644
--- a/src/corelib/mimetypes/qmimetypeparser.cpp
+++ b/src/corelib/mimetypes/qmimetypeparser.cpp
@@ -57,6 +57,9 @@ static const char matchMaskAttributeC[] = "mask";
     \sa QMimeTypeParser
 */
 
+QMimeTypeParser::~QMimeTypeParser()
+    = default;
+
 /*!
     \class QMimeTypeParserBase
     \inmodule QtCore
@@ -69,6 +72,9 @@ static const char matchMaskAttributeC[] = "mask";
     \sa QMimeTypeParser
 */
 
+QMimeTypeParserBase::~QMimeTypeParserBase()
+    = default;
+
 /*!
     \fn virtual bool QMimeTypeParserBase::process(const QMimeType &t, QString *errorMessage) = 0;
     Overwrite to process the sequence of parsed data
diff --git a/src/corelib/mimetypes/qmimetypeparser_p.h b/src/corelib/mimetypes/qmimetypeparser_p.h
index d4266ffcc03..34e588ccf85 100644
--- a/src/corelib/mimetypes/qmimetypeparser_p.h
+++ b/src/corelib/mimetypes/qmimetypeparser_p.h
@@ -47,7 +47,7 @@ class QMimeTypeParserBase
 
 public:
     QMimeTypeParserBase() {}
-    virtual ~QMimeTypeParserBase() {}
+    virtual ~QMimeTypeParserBase();
 
     bool parse(QIODevice *dev, const QString &fileName, QString *errorMessage);
 
@@ -86,6 +86,7 @@ class QMimeTypeParser : public QMimeTypeParserBase
 {
 public:
     explicit QMimeTypeParser(QMimeXMLProvider &provider) : m_provider(provider) {}
+    ~QMimeTypeParser() override;
 
 protected:
     inline bool process(const QMimeTypeXMLData &t, QString *) override