diff --git a/src/plugins/cmakeprojectmanager/cmakecbpparser.h b/src/plugins/cmakeprojectmanager/cmakecbpparser.h
index 6069b7d1ad6..d1f5cf9569f 100644
--- a/src/plugins/cmakeprojectmanager/cmakecbpparser.h
+++ b/src/plugins/cmakeprojectmanager/cmakecbpparser.h
@@ -38,7 +38,6 @@
 
 namespace ProjectExplorer {
 class FileNode;
-class Kit;
 } // namespace ProjectExplorer
 
 namespace CMakeProjectManager {
diff --git a/src/plugins/cmakeprojectmanager/cmakeeditor.h b/src/plugins/cmakeprojectmanager/cmakeeditor.h
index 7d5bda378cf..93151db5471 100644
--- a/src/plugins/cmakeprojectmanager/cmakeeditor.h
+++ b/src/plugins/cmakeprojectmanager/cmakeeditor.h
@@ -32,7 +32,6 @@ namespace CMakeProjectManager {
 namespace Internal {
 
 class CMakeEditorWidget;
-class CMakeSettingsPage;
 
 class CMakeEditor : public TextEditor::BaseTextEditor
 {
diff --git a/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h b/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h
index 934d7b64e88..387addeac1d 100644
--- a/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h
+++ b/src/plugins/cmakeprojectmanager/cmakefilecompletionassist.h
@@ -31,7 +31,6 @@
 namespace CMakeProjectManager {
 namespace Internal {
 
-class CMakeSettingsPage;
 
 class CMakeFileCompletionAssist : public TextEditor::KeywordsCompletionAssistProcessor
 {
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.h b/src/plugins/cmakeprojectmanager/cmakeproject.h
index 2a6964fc8b6..40d3382a64b 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.h
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.h
@@ -41,10 +41,6 @@
 
 #include <memory>
 
-QT_BEGIN_NAMESPACE
-class QFileSystemWatcher;
-QT_END_NAMESPACE
-
 namespace CppTools { class CppProjectUpdater; }
 
 namespace CMakeProjectManager {
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectmanager.h b/src/plugins/cmakeprojectmanager/cmakeprojectmanager.h
index c1d19514ea5..0a045c19c04 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectmanager.h
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectmanager.h
@@ -34,7 +34,6 @@ QT_END_NAMESPACE
 namespace CMakeProjectManager {
 namespace Internal {
 
-class CMakeSettingsPage;
 
 class CMakeManager : public QObject
 {
diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h b/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h
index de3112184a0..7f8524ff745 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectplugin.h
@@ -34,7 +34,6 @@ namespace Utils { class ParameterAction; }
 namespace CMakeProjectManager {
 
 class CMakeProject;
-class CMakeToolManager;
 
 namespace Internal {
 
diff --git a/src/plugins/cmakeprojectmanager/servermodereader.h b/src/plugins/cmakeprojectmanager/servermodereader.h
index f861483227a..bf5fe7337e7 100644
--- a/src/plugins/cmakeprojectmanager/servermodereader.h
+++ b/src/plugins/cmakeprojectmanager/servermodereader.h
@@ -36,7 +36,6 @@
 namespace CMakeProjectManager {
 namespace Internal {
 
-class CMakeListsNode;
 
 class ServerModeReader : public BuildDirReader
 {