diff --git a/src/corelib/kernel/qabstractnativeeventfilter.cpp b/src/corelib/kernel/qabstractnativeeventfilter.cpp
index ad5e7f888ce..b38e225f0df 100644
--- a/src/corelib/kernel/qabstractnativeeventfilter.cpp
+++ b/src/corelib/kernel/qabstractnativeeventfilter.cpp
@@ -61,6 +61,7 @@ QT_BEGIN_NAMESPACE
 */
 QAbstractNativeEventFilter::QAbstractNativeEventFilter()
 {
+    Q_UNUSED(d);
 }
 
 /*!
diff --git a/src/corelib/tools/qbytearraymatcher.cpp b/src/corelib/tools/qbytearraymatcher.cpp
index 59d7629c275..bcd6a56aada 100644
--- a/src/corelib/tools/qbytearraymatcher.cpp
+++ b/src/corelib/tools/qbytearraymatcher.cpp
@@ -164,6 +164,7 @@ QByteArrayMatcher::QByteArrayMatcher(const QByteArrayMatcher &other)
 */
 QByteArrayMatcher::~QByteArrayMatcher()
 {
+    Q_UNUSED(d);
 }
 
 /*!
diff --git a/src/corelib/tools/qstringmatcher.cpp b/src/corelib/tools/qstringmatcher.cpp
index 0aacea4762a..d54e9c7ba76 100644
--- a/src/corelib/tools/qstringmatcher.cpp
+++ b/src/corelib/tools/qstringmatcher.cpp
@@ -198,6 +198,7 @@ QStringMatcher::QStringMatcher(const QStringMatcher &other)
 */
 QStringMatcher::~QStringMatcher()
 {
+    Q_UNUSED(d_ptr);
 }
 
 /*!
diff --git a/src/corelib/tools/qtextboundaryfinder.cpp b/src/corelib/tools/qtextboundaryfinder.cpp
index eb861b72898..7b8fbebb224 100644
--- a/src/corelib/tools/qtextboundaryfinder.cpp
+++ b/src/corelib/tools/qtextboundaryfinder.cpp
@@ -229,6 +229,7 @@ QTextBoundaryFinder &QTextBoundaryFinder::operator=(const QTextBoundaryFinder &o
 */
 QTextBoundaryFinder::~QTextBoundaryFinder()
 {
+    Q_UNUSED(unused);
     if (freePrivate)
         free(d);
 }