diff --git a/src/plugins/qmakeprojectmanager/addlibrarywizard.h b/src/plugins/qmakeprojectmanager/addlibrarywizard.h
index 6a0201c398b..0c4cb4b7601 100644
--- a/src/plugins/qmakeprojectmanager/addlibrarywizard.h
+++ b/src/plugins/qmakeprojectmanager/addlibrarywizard.h
@@ -30,7 +30,6 @@
 
 QT_BEGIN_NAMESPACE
 class QRadioButton;
-class QCheckBox;
 class QLabel;
 QT_END_NAMESPACE
 
diff --git a/src/plugins/qmakeprojectmanager/customwidgetwizard/plugingenerator.h b/src/plugins/qmakeprojectmanager/customwidgetwizard/plugingenerator.h
index 2307a4ba779..a2ed5ef749a 100644
--- a/src/plugins/qmakeprojectmanager/customwidgetwizard/plugingenerator.h
+++ b/src/plugins/qmakeprojectmanager/customwidgetwizard/plugingenerator.h
@@ -31,7 +31,6 @@
 #include <QMap>
 
 QT_BEGIN_NAMESPACE
-class QWidget;
 QT_END_NAMESPACE
 
 namespace Core { class GeneratedFile; }
diff --git a/src/plugins/qmakeprojectmanager/desktopqmakerunconfiguration.h b/src/plugins/qmakeprojectmanager/desktopqmakerunconfiguration.h
index 706758038f4..5dde3c35349 100644
--- a/src/plugins/qmakeprojectmanager/desktopqmakerunconfiguration.h
+++ b/src/plugins/qmakeprojectmanager/desktopqmakerunconfiguration.h
@@ -42,7 +42,6 @@ QT_END_NAMESPACE
 namespace QmakeProjectManager {
 
 class QmakeProFile;
-class QmakeProFileNode;
 class QmakeProject;
 
 namespace Internal {
diff --git a/src/plugins/qmakeprojectmanager/externaleditors.h b/src/plugins/qmakeprojectmanager/externaleditors.h
index 413b46a7d15..b7441501c41 100644
--- a/src/plugins/qmakeprojectmanager/externaleditors.h
+++ b/src/plugins/qmakeprojectmanager/externaleditors.h
@@ -33,7 +33,6 @@
 #include <QMap>
 
 QT_BEGIN_NAMESPACE
-class QProcess;
 class QTcpSocket;
 QT_END_NAMESPACE
 
diff --git a/src/plugins/qmakeprojectmanager/makefileparse.h b/src/plugins/qmakeprojectmanager/makefileparse.h
index aefc81e1f57..9a2abeb00ee 100644
--- a/src/plugins/qmakeprojectmanager/makefileparse.h
+++ b/src/plugins/qmakeprojectmanager/makefileparse.h
@@ -29,10 +29,6 @@
 #include <qtsupport/baseqtversion.h>
 #include <qmakeprojectmanager/qmakestep.h>
 
-QT_BEGIN_NAMESPACE
-class QLogggingCategory;
-QT_END_NAMESPACE
-
 namespace QmakeProjectManager {
 namespace Internal {
 
diff --git a/src/plugins/qmakeprojectmanager/makestep.h b/src/plugins/qmakeprojectmanager/makestep.h
index 9f0abc91923..72a0b54e2ef 100644
--- a/src/plugins/qmakeprojectmanager/makestep.h
+++ b/src/plugins/qmakeprojectmanager/makestep.h
@@ -32,7 +32,6 @@
 namespace ProjectExplorer {
 class BuildStep;
 class IBuildStepFactory;
-class Task;
 }
 
 namespace QmakeProjectManager {
diff --git a/src/plugins/qmakeprojectmanager/profilehoverhandler.h b/src/plugins/qmakeprojectmanager/profilehoverhandler.h
index 381329a93c3..cc9f91ef02b 100644
--- a/src/plugins/qmakeprojectmanager/profilehoverhandler.h
+++ b/src/plugins/qmakeprojectmanager/profilehoverhandler.h
@@ -29,7 +29,6 @@
 #include <texteditor/codeassist/keywordscompletionassist.h>
 
 QT_BEGIN_NAMESPACE
-class QUrl;
 QT_END_NAMESPACE
 
 namespace QmakeProjectManager {
diff --git a/src/plugins/qmakeprojectmanager/qmakeprojectconfigwidget.h b/src/plugins/qmakeprojectmanager/qmakeprojectconfigwidget.h
index 31829d8acd2..a698653d7e7 100644
--- a/src/plugins/qmakeprojectmanager/qmakeprojectconfigwidget.h
+++ b/src/plugins/qmakeprojectmanager/qmakeprojectconfigwidget.h
@@ -35,7 +35,6 @@ namespace Utils { class DetailsWidget; }
 
 namespace QmakeProjectManager {
 class QmakeBuildConfiguration;
-class QmakeProFileNode;
 
 namespace Internal {
 namespace Ui { class QmakeProjectConfigWidget; }
diff --git a/src/plugins/qmakeprojectmanager/qmakestep.h b/src/plugins/qmakeprojectmanager/qmakestep.h
index a69db1113eb..caf12b129a0 100644
--- a/src/plugins/qmakeprojectmanager/qmakestep.h
+++ b/src/plugins/qmakeprojectmanager/qmakestep.h
@@ -38,7 +38,6 @@ class Abi;
 class BuildStep;
 class IBuildStepFactory;
 class Project;
-class Kit;
 } // namespace ProjectExplorer
 
 namespace QtSupport { class BaseQtVersion; }