diff --git a/src/plugins/projectexplorer/buildconfiguration.h b/src/plugins/projectexplorer/buildconfiguration.h
index fb80a4d4fb40d6020471478e78fb77beaa415a5d..741227c03a2805dde41cf2cd9e7e20a607b50152 100644
--- a/src/plugins/projectexplorer/buildconfiguration.h
+++ b/src/plugins/projectexplorer/buildconfiguration.h
@@ -153,4 +153,3 @@ signals:
 
 } // namespace ProjectExplorer
 
-Q_DECLARE_METATYPE(ProjectExplorer::BuildConfiguration *)
diff --git a/src/plugins/projectexplorer/buildsteplist.h b/src/plugins/projectexplorer/buildsteplist.h
index c91bfc508ae65ceadd2343146a400f906a59d2e1..a24e8190bf8224d59dca22e1c381018d6646e60b 100644
--- a/src/plugins/projectexplorer/buildsteplist.h
+++ b/src/plugins/projectexplorer/buildsteplist.h
@@ -79,4 +79,3 @@ private:
 
 } // namespace ProjectExplorer
 
-Q_DECLARE_METATYPE(ProjectExplorer::BuildStepList *)
diff --git a/src/plugins/projectexplorer/clangparser.cpp b/src/plugins/projectexplorer/clangparser.cpp
index b7060d92d57d61b57954ba227b2f1f8c2653ea5f..56d062a46c41477d79efcced2cb1df391ce719ff 100644
--- a/src/plugins/projectexplorer/clangparser.cpp
+++ b/src/plugins/projectexplorer/clangparser.cpp
@@ -127,7 +127,6 @@ void ClangParser::stdError(const QString &line)
 #   include <QTest>
 
 #   include "projectexplorer.h"
-#   include "metatypedeclarations.h"
 #   include "outputparser_test.h"
 
 void ProjectExplorerPlugin::testClangOutputParser_data()
diff --git a/src/plugins/projectexplorer/customparser.cpp b/src/plugins/projectexplorer/customparser.cpp
index db68e85dec83739db3db2eb31fd078ecf2246099..d6f96f47dece0ebbf811b69f2f3566a205ae79e6 100644
--- a/src/plugins/projectexplorer/customparser.cpp
+++ b/src/plugins/projectexplorer/customparser.cpp
@@ -178,7 +178,6 @@ bool CustomParser::parseLine(const QString &rawLine, CustomParserExpression::Cus
 #   include <QTest>
 
 #   include "projectexplorer.h"
-#   include "metatypedeclarations.h"
 #   include "outputparser_test.h"
 
 void ProjectExplorerPlugin::testCustomOutputParsers_data()
diff --git a/src/plugins/projectexplorer/deployconfiguration.h b/src/plugins/projectexplorer/deployconfiguration.h
index fb59feeb4d0e846f9441b27a40b2758502b213c5..5648cbe15ca3ec48e98a8454ce8862fc4a3cb249 100644
--- a/src/plugins/projectexplorer/deployconfiguration.h
+++ b/src/plugins/projectexplorer/deployconfiguration.h
@@ -131,4 +131,3 @@ private:
 
 } // namespace ProjectExplorer
 
-Q_DECLARE_METATYPE(ProjectExplorer::DeployConfiguration *)
diff --git a/src/plugins/projectexplorer/gccparser.cpp b/src/plugins/projectexplorer/gccparser.cpp
index 5ec7faa9045b6fe663a2fd9473e2c33f786f7b6e..e1d2e21b33671db16140c6afd41f3a088e87119d 100644
--- a/src/plugins/projectexplorer/gccparser.cpp
+++ b/src/plugins/projectexplorer/gccparser.cpp
@@ -186,7 +186,6 @@ void GccParser::amendDescription(const QString &desc, bool monospaced)
 #   include <QTest>
 
 #   include "projectexplorer.h"
-#   include "metatypedeclarations.h"
 #   include "outputparser_test.h"
 
 void ProjectExplorerPlugin::testGccOutputParsers_data()
diff --git a/src/plugins/projectexplorer/gnumakeparser.cpp b/src/plugins/projectexplorer/gnumakeparser.cpp
index 19da83ef797a542d63329465a2c542afc94fc042..271d65df64ce45ac38461ec2e95fe4dd5a4ca164 100644
--- a/src/plugins/projectexplorer/gnumakeparser.cpp
+++ b/src/plugins/projectexplorer/gnumakeparser.cpp
@@ -204,8 +204,6 @@ QStringList GnuMakeParser::searchDirectories() const
 #   include "projectexplorer.h"
 #   include "projectexplorerconstants.h"
 
-#   include "metatypedeclarations.h"
-
 GnuMakeParserTester::GnuMakeParserTester(GnuMakeParser *p, QObject *parent) :
     QObject(parent),
     parser(p)
diff --git a/src/plugins/projectexplorer/ioutputparser.h b/src/plugins/projectexplorer/ioutputparser.h
index bd668e87666c3dac056c3318d3ff80f8fb12734f..92bcbb0f1638de98a637d5b49394f56def6b720d 100644
--- a/src/plugins/projectexplorer/ioutputparser.h
+++ b/src/plugins/projectexplorer/ioutputparser.h
@@ -75,4 +75,3 @@ private:
 
 } // namespace ProjectExplorer
 
-Q_DECLARE_METATYPE(ProjectExplorer::IOutputParser*)
diff --git a/src/plugins/projectexplorer/ipotentialkit.h b/src/plugins/projectexplorer/ipotentialkit.h
index 3be5b9907e3db95eb9888a4d3cc1e7136e8fbeb5..40237682aeebd3e515b6eb32fc48f204f7723696 100644
--- a/src/plugins/projectexplorer/ipotentialkit.h
+++ b/src/plugins/projectexplorer/ipotentialkit.h
@@ -42,4 +42,3 @@ public:
 };
 
 }
-Q_DECLARE_METATYPE(ProjectExplorer::IPotentialKit*)
diff --git a/src/plugins/projectexplorer/linuxiccparser.cpp b/src/plugins/projectexplorer/linuxiccparser.cpp
index d4bb307064b088987a49cb32882637345e7130bd..c9b2750630a1ddd27d15a4c6bcda74be7173ca88 100644
--- a/src/plugins/projectexplorer/linuxiccparser.cpp
+++ b/src/plugins/projectexplorer/linuxiccparser.cpp
@@ -128,7 +128,6 @@ void LinuxIccParser::doFlush()
 #ifdef WITH_TESTS
 #   include <QTest>
 #   include "projectexplorer.h"
-#   include "metatypedeclarations.h"
 #   include "outputparser_test.h"
 
 void ProjectExplorerPlugin::testLinuxIccOutputParsers_data()
diff --git a/src/plugins/projectexplorer/metatypedeclarations.h b/src/plugins/projectexplorer/metatypedeclarations.h
deleted file mode 100644
index 61b7b59b40afb3ff5c25e8863f68973a9d6c575a..0000000000000000000000000000000000000000
--- a/src/plugins/projectexplorer/metatypedeclarations.h
+++ /dev/null
@@ -1,43 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of Qt Creator.
-**
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3 as published by the Free Software
-** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
-** included in the packaging of this file. Please review the following
-** information to ensure the GNU General Public License requirements will
-** be met: https://www.gnu.org/licenses/gpl-3.0.html.
-**
-****************************************************************************/
-
-#pragma once
-
-#include <QMetaType>
-
-namespace ProjectExplorer {
-class IProjectManager;
-class SessionManager;
-class Project;
-}
-
-// Required for Q_DECLARE_METATYPE of forward-declared types.
-Q_DECLARE_OPAQUE_POINTER(ProjectExplorer::Project*)
-Q_DECLARE_OPAQUE_POINTER(ProjectExplorer::IProjectManager*)
-Q_DECLARE_OPAQUE_POINTER(ProjectExplorer::SessionManager*)
-
-Q_DECLARE_METATYPE(QList<ProjectExplorer::Project*>)
-Q_DECLARE_METATYPE(ProjectExplorer::SessionManager*)
-Q_DECLARE_METATYPE(ProjectExplorer::IProjectManager*)
diff --git a/src/plugins/projectexplorer/outputparser_test.h b/src/plugins/projectexplorer/outputparser_test.h
index 630767669b1c44419bce7ca780bce49b2636aea0..f071da6bb325f90a1b3daf997cac79ae0c245747 100644
--- a/src/plugins/projectexplorer/outputparser_test.h
+++ b/src/plugins/projectexplorer/outputparser_test.h
@@ -30,7 +30,6 @@
 #include "projectexplorer_export.h"
 
 #include "ioutputparser.h"
-#include "metatypedeclarations.h"
 #include "task.h"
 
 namespace ProjectExplorer {
diff --git a/src/plugins/projectexplorer/projectconfiguration.h b/src/plugins/projectexplorer/projectconfiguration.h
index 4715c6453b933997bd7aba4297f6ac76c8100c6a..9f0103eae27ddc5b0621761bb057519d7b331fff 100644
--- a/src/plugins/projectexplorer/projectconfiguration.h
+++ b/src/plugins/projectexplorer/projectconfiguration.h
@@ -82,4 +82,3 @@ PROJECTEXPLORER_EXPORT QString displayNameFromMap(const QVariantMap &map);
 
 } // namespace ProjectExplorer
 
-Q_DECLARE_METATYPE(ProjectExplorer::ProjectConfiguration *)
diff --git a/src/plugins/projectexplorer/projectexplorer.pro b/src/plugins/projectexplorer/projectexplorer.pro
index 586d0cc1ae0ab173be7197107c6fb2f731c77e34..3db58c2586ce035044ef9c94f2c59bcea7a6b245 100644
--- a/src/plugins/projectexplorer/projectexplorer.pro
+++ b/src/plugins/projectexplorer/projectexplorer.pro
@@ -105,7 +105,6 @@ HEADERS += projectexplorer.h \
     abstractprocessstep.h \
     taskhub.h \
     localapplicationruncontrol.h \
-    metatypedeclarations.h \
     headerpath.h \
     gcctoolchainfactories.h \
     appoutputpane.h \
diff --git a/src/plugins/projectexplorer/projectexplorer.qbs b/src/plugins/projectexplorer/projectexplorer.qbs
index 3891598c84e9de1b21494648a70e768a160afd67..19e294b959b3a9cac2b0301ab08f50a30d7f87fc 100644
--- a/src/plugins/projectexplorer/projectexplorer.qbs
+++ b/src/plugins/projectexplorer/projectexplorer.qbs
@@ -95,7 +95,6 @@ QtcPlugin {
             "linuxiccparser.cpp", "linuxiccparser.h",
             "localapplicationruncontrol.cpp", "localapplicationruncontrol.h",
             "localenvironmentaspect.cpp", "localenvironmentaspect.h",
-            "metatypedeclarations.h",
             "miniprojecttargetselector.cpp", "miniprojecttargetselector.h",
             "namedwidget.cpp", "namedwidget.h",
             "nodesvisitor.cpp", "nodesvisitor.h",
diff --git a/src/plugins/projectexplorer/runconfiguration.h b/src/plugins/projectexplorer/runconfiguration.h
index 16762d95d944e017523bc703a9a8655dee5ecf15..c5b6e2f82f29344c451f01d5a0d11cc062eb46e6 100644
--- a/src/plugins/projectexplorer/runconfiguration.h
+++ b/src/plugins/projectexplorer/runconfiguration.h
@@ -406,6 +406,3 @@ private:
 
 } // namespace ProjectExplorer
 
-// Allow a RunConfiguration to be stored in a QVariant
-Q_DECLARE_METATYPE(ProjectExplorer::RunConfiguration*)
-Q_DECLARE_METATYPE(ProjectExplorer::RunControl*)
diff --git a/src/plugins/projectexplorer/target.h b/src/plugins/projectexplorer/target.h
index c662428651f6d5a5c206d9dc53fdf0b279d86170..b3498b0a299a7c8db97ef917dfc0eca5030f6565 100644
--- a/src/plugins/projectexplorer/target.h
+++ b/src/plugins/projectexplorer/target.h
@@ -175,4 +175,3 @@ private:
 
 } // namespace ProjectExplorer
 
-Q_DECLARE_METATYPE(ProjectExplorer::Target *)
diff --git a/src/plugins/projectexplorer/task.h b/src/plugins/projectexplorer/task.h
index 0b291016546052e17253a913fccd4eb53ccb1738..592bef9cab748139a089079f89cfe2306a81f418 100644
--- a/src/plugins/projectexplorer/task.h
+++ b/src/plugins/projectexplorer/task.h
@@ -91,4 +91,3 @@ bool PROJECTEXPLORER_EXPORT operator<(const Task &a, const Task &b);
 } //namespace ProjectExplorer
 
 Q_DECLARE_METATYPE(ProjectExplorer::Task)
-Q_DECLARE_METATYPE(QList<ProjectExplorer::Task>)
diff --git a/src/plugins/projectexplorer/xcodebuildparser.cpp b/src/plugins/projectexplorer/xcodebuildparser.cpp
index 8a2578b6714b9f1e9b0e919a19861824f2475368..41f24e0a3844898c44e6f6048f8774819e8b02ab 100644
--- a/src/plugins/projectexplorer/xcodebuildparser.cpp
+++ b/src/plugins/projectexplorer/xcodebuildparser.cpp
@@ -121,8 +121,6 @@ void XcodebuildParser::stdError(const QString &line)
 #   include "outputparser_test.h"
 #   include "projectexplorer.h"
 
-#   include "metatypedeclarations.h"
-
 using namespace ProjectExplorer;
 
 Q_DECLARE_METATYPE(ProjectExplorer::XcodebuildParser::XcodebuildStatus)
diff --git a/src/plugins/qtsupport/qtparser.cpp b/src/plugins/qtsupport/qtparser.cpp
index 058f5c4c145d5747e5e6326fd3b27457b63cec74..a1642222f1cf529334e54a9921eacf601c3f23cd 100644
--- a/src/plugins/qtsupport/qtparser.cpp
+++ b/src/plugins/qtsupport/qtparser.cpp
@@ -85,7 +85,6 @@ void QtParser::stdError(const QString &line)
 
 #   include "qtsupportplugin.h"
 #   include <projectexplorer/projectexplorerconstants.h>
-#   include <projectexplorer/metatypedeclarations.h>
 #   include <projectexplorer/outputparser_test.h>
 
 using namespace ProjectExplorer;