diff --git a/src/libs/qmldebug/baseenginedebugclient.h b/src/libs/qmldebug/baseenginedebugclient.h
index 251ccc9a90db903f5a31c91ac65c2e5f1c335f6e..770724bbd8c7dd7ddebb4c5bac811617eb3c58d7 100644
--- a/src/libs/qmldebug/baseenginedebugclient.h
+++ b/src/libs/qmldebug/baseenginedebugclient.h
@@ -245,7 +245,6 @@ private:
 
 Q_DECLARE_METATYPE(QmlDebug::ObjectReference)
 Q_DECLARE_METATYPE(QmlDebug::EngineReference)
-Q_DECLARE_METATYPE(QList<QmlDebug::EngineReference>)
 Q_DECLARE_METATYPE(QmlDebug::ContextReference)
 
 QT_BEGIN_NAMESPACE
diff --git a/src/plugins/debugger/cdb/cdbengine.cpp b/src/plugins/debugger/cdb/cdbengine.cpp
index 4c7dc4e9c55ca482b12d76d33534af3b92634697..4468147efd6ac482821515e798a88f27b293b106 100644
--- a/src/plugins/debugger/cdb/cdbengine.cpp
+++ b/src/plugins/debugger/cdb/cdbengine.cpp
@@ -76,9 +76,6 @@
 
 #include <cctype>
 
-Q_DECLARE_METATYPE(Debugger::Internal::DisassemblerAgent*)
-Q_DECLARE_METATYPE(Debugger::Internal::MemoryAgent*)
-
 enum { debug = 0 };
 enum { debugLocals = 0 };
 enum { debugSourceMapping = 0 };
diff --git a/src/plugins/debugger/watchhandler.h b/src/plugins/debugger/watchhandler.h
index 094ffaf3de5c8d733c8239a27319be9b5bcb979e..65a37e06ec4660132951f751e7edc1e15652a7b2 100644
--- a/src/plugins/debugger/watchhandler.h
+++ b/src/plugins/debugger/watchhandler.h
@@ -170,6 +170,6 @@ private:
 } // namespace Internal
 } // namespace Debugger
 
-Q_DECLARE_METATYPE(Debugger::Internal::DisplayFormats)
+Q_DECLARE_METATYPE(Debugger::Internal::DisplayFormat)
 
 #endif // DEBUGGER_WATCHHANDLER_H
diff --git a/tests/manual/debugger/simple/simple_test_app.cpp b/tests/manual/debugger/simple/simple_test_app.cpp
index 7e0559be410ec5f5b4d321e33ccacf9c1889d0e9..9688dbf5eb23aa9b53b7b8095d8e3dfefa72384b 100644
--- a/tests/manual/debugger/simple/simple_test_app.cpp
+++ b/tests/manual/debugger/simple/simple_test_app.cpp
@@ -4292,8 +4292,6 @@ namespace qthread {
 
 
 Q_DECLARE_METATYPE(QHostAddress)
-Q_DECLARE_METATYPE(QList<int>)
-Q_DECLARE_METATYPE(QStringList)
 
 typedef QMap<uint, QStringList> QMapUIntQStringList;
 Q_DECLARE_METATYPE(QMapUIntQStringList)