diff --git a/src/plugins/cmakeprojectmanager/builddirmanager.cpp b/src/plugins/cmakeprojectmanager/builddirmanager.cpp
index 0a30e0d72e2..1064d308243 100644
--- a/src/plugins/cmakeprojectmanager/builddirmanager.cpp
+++ b/src/plugins/cmakeprojectmanager/builddirmanager.cpp
@@ -49,7 +49,6 @@
 #include <QDateTime>
 #include <QFile>
 #include <QFileInfo>
-#include <QFileSystemWatcher>
 #include <QMessageBox>
 #include <QRegularExpression>
 #include <QSet>
@@ -97,26 +96,14 @@ static QStringList toArguments(const CMakeConfig &config, const ProjectExplorer:
 // --------------------------------------------------------------------
 
 BuildDirManager::BuildDirManager(CMakeBuildConfiguration *bc) :
-    m_buildConfiguration(bc),
-    m_watcher(new QFileSystemWatcher(this))
+    m_buildConfiguration(bc)
 {
     QTC_ASSERT(bc, return);
     m_projectName = sourceDirectory().fileName();
 
     m_reparseTimer.setSingleShot(true);
-    m_reparseTimer.setInterval(5000);
+    m_reparseTimer.setInterval(2000);
     connect(&m_reparseTimer, &QTimer::timeout, this, &BuildDirManager::parse);
-
-    connect(m_watcher, &QFileSystemWatcher::fileChanged, this, [this]() {
-        if (isParsing())
-            return;
-
-        const CMakeTool *tool = CMakeKitInformation::cmakeTool(m_buildConfiguration->target()->kit());
-        if (!tool->isAutoRun())
-            return;
-
-        m_reparseTimer.start();
-    });
 }
 
 BuildDirManager::~BuildDirManager()
@@ -163,6 +150,18 @@ bool BuildDirManager::isParsing() const
     return false;
 }
 
+void BuildDirManager::cmakeFilesChanged()
+{
+    if (isParsing())
+        return;
+
+    const CMakeTool *tool = CMakeKitInformation::cmakeTool(m_buildConfiguration->target()->kit());
+    if (!tool->isAutoRun())
+        return;
+
+    m_reparseTimer.start();
+}
+
 void BuildDirManager::forceReparse()
 {
     if (m_buildConfiguration->target()->activeBuildConfiguration() != m_buildConfiguration)
@@ -186,13 +185,8 @@ void BuildDirManager::resetData()
     m_cmakeCache.clear();
     m_projectName.clear();
     m_buildTargets.clear();
-    m_watchedFiles.clear();
     qDeleteAll(m_files);
     m_files.clear();
-
-    const QStringList watchedFiles = m_watcher->files();
-    if (!watchedFiles.isEmpty())
-        m_watcher->removePaths(watchedFiles);
 }
 
 bool BuildDirManager::persistCMakeState()
@@ -229,8 +223,8 @@ void BuildDirManager::parse()
         return;
     }
 
-    const bool mustUpdate = m_watchedFiles.isEmpty()
-            || Utils::anyOf(m_watchedFiles, [&cbpFileFi](const Utils::FileName &f) {
+    const bool mustUpdate = m_cmakeFiles.isEmpty()
+            || Utils::anyOf(m_cmakeFiles, [&cbpFileFi](const Utils::FileName &f) {
                    return f.toFileInfo().lastModified() > cbpFileFi.lastModified();
                });
     if (mustUpdate) {
@@ -257,11 +251,6 @@ void BuildDirManager::clearCache()
     forceReparse();
 }
 
-bool BuildDirManager::isProjectFile(const Utils::FileName &fileName) const
-{
-    return m_watchedFiles.contains(fileName);
-}
-
 QString BuildDirManager::projectName() const
 {
     return m_projectName;
@@ -277,6 +266,11 @@ QList<ProjectExplorer::FileNode *> BuildDirManager::files()
     return m_files;
 }
 
+QSet<Utils::FileName> BuildDirManager::cmakeFiles()
+{
+    return m_cmakeFiles;
+}
+
 void BuildDirManager::clearFiles()
 {
     m_files.clear();
@@ -361,15 +355,19 @@ void BuildDirManager::extractData()
 
     m_projectName = sourceDirectory().fileName();
     m_files.append(new ProjectExplorer::FileNode(topCMake, ProjectExplorer::ProjectFileType, false));
-    m_watchedFiles.insert(topCMake);
+    // Do not insert topCMake into m_cmakeFiles: The project already watches that!
 
     // Find cbp file
     QString cbpFile = CMakeManager::findCbpFile(workDirectory().toString());
     if (cbpFile.isEmpty())
         return;
+    m_cmakeFiles.insert(Utils::FileName::fromString(cbpFile));
 
-    m_watcher->addPath(cbpFile);
-    m_watcher->addPath(workDirectory().toString() + QLatin1String("/CMakeCache.txt"));
+    // Add CMakeCache.txt file:
+    Utils::FileName cacheFile = workDirectory();
+    cacheFile.appendPath(QLatin1String("CMakeCache.txt"));
+    if (cacheFile.toFileInfo().exists())
+        m_cmakeFiles.insert(cacheFile);
 
     // setFolderName
     CMakeCbpParser cbpparser;
@@ -380,21 +378,14 @@ void BuildDirManager::extractData()
     m_projectName = cbpparser.projectName();
 
     m_files = cbpparser.fileList();
-    QSet<Utils::FileName> projectFiles;
     if (cbpparser.hasCMakeFiles()) {
         m_files.append(cbpparser.cmakeFileList());
         foreach (const ProjectExplorer::FileNode *node, cbpparser.cmakeFileList())
-            projectFiles.insert(node->filePath());
+            m_cmakeFiles.insert(node->filePath());
     } else {
         m_files.append(new ProjectExplorer::FileNode(topCMake, ProjectExplorer::ProjectFileType, false));
-        projectFiles.insert(topCMake);
     }
 
-    m_watchedFiles = projectFiles;
-    const QStringList toWatch
-            = Utils::transform(m_watchedFiles.toList(), [](const Utils::FileName &fn) { return fn.toString(); });
-    m_watcher->addPaths(toWatch);
-
     m_buildTargets = cbpparser.buildTargets();
 }
 
diff --git a/src/plugins/cmakeprojectmanager/builddirmanager.h b/src/plugins/cmakeprojectmanager/builddirmanager.h
index 419a87c3d15..d830e8a8595 100644
--- a/src/plugins/cmakeprojectmanager/builddirmanager.h
+++ b/src/plugins/cmakeprojectmanager/builddirmanager.h
@@ -73,6 +73,8 @@ public:
     const CMakeConfig intendedConfiguration() const;
     bool isParsing() const;
 
+    void cmakeFilesChanged();
+
     void parse();
     void clearCache();
     void forceReparse();
@@ -80,10 +82,10 @@ public:
     void resetData();
     bool persistCMakeState();
 
-    bool isProjectFile(const Utils::FileName &fileName) const;
     QString projectName() const;
     QList<CMakeBuildTarget> buildTargets() const;
     QList<ProjectExplorer::FileNode *> files();
+    QSet<Utils::FileName> cmakeFiles();
     void clearFiles();
     CMakeConfig parsedConfiguration() const;
 
@@ -115,10 +117,9 @@ private:
     QTemporaryDir *m_tempDir = nullptr;
     mutable CMakeConfig m_cmakeCache;
 
-    QSet<Utils::FileName> m_watchedFiles;
+    QSet<Utils::FileName> m_cmakeFiles;
     QString m_projectName;
     QList<CMakeBuildTarget> m_buildTargets;
-    QFileSystemWatcher *m_watcher;
     QList<ProjectExplorer::FileNode *> m_files;
 
     // For error reporting:
diff --git a/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp b/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp
index 8d9d46e4ba0..a013083c572 100644
--- a/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp
@@ -71,6 +71,11 @@ CMakeBuildConfiguration::~CMakeBuildConfiguration()
     m_buildDirManager->deleteLater(); // Do not block while waiting for cmake...
 }
 
+void CMakeBuildConfiguration::cmakeFilesChanged()
+{
+    m_buildDirManager->cmakeFilesChanged();
+}
+
 bool CMakeBuildConfiguration::isEnabled() const
 {
     return m_error.isEmpty();
diff --git a/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.h b/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.h
index 37ec1aa4275..d56965ffb6c 100644
--- a/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.h
+++ b/src/plugins/cmakeprojectmanager/cmakebuildconfiguration.h
@@ -52,6 +52,8 @@ public:
     CMakeBuildConfiguration(ProjectExplorer::Target *parent);
     ~CMakeBuildConfiguration();
 
+    void cmakeFilesChanged();
+
     bool isEnabled() const override;
     QString disabledReason() const override;
 
diff --git a/src/plugins/cmakeprojectmanager/cmakefile.cpp b/src/plugins/cmakeprojectmanager/cmakefile.cpp
index 0d338840166..30a1db0e153 100644
--- a/src/plugins/cmakeprojectmanager/cmakefile.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakefile.cpp
@@ -27,6 +27,8 @@
 #include "cmakeproject.h"
 #include "cmakeprojectconstants.h"
 
+#include <projectexplorer/target.h>
+
 #include <utils/fileutils.h>
 
 using namespace Utils;
@@ -34,7 +36,7 @@ using namespace Utils;
 namespace CMakeProjectManager {
 namespace Internal {
 
-CMakeFile::CMakeFile(const FileName &fileName)
+CMakeFile::CMakeFile(CMakeProject *project, const FileName &fileName) : m_project(project)
 {
     setId("Cmake.ProjectFile");
     setMimeType(QLatin1String(Constants::CMAKEPROJECTMIMETYPE));
@@ -48,5 +50,15 @@ Core::IDocument::ReloadBehavior CMakeFile::reloadBehavior(ChangeTrigger state, C
     return BehaviorSilent;
 }
 
+bool CMakeFile::reload(QString *errorString, Core::IDocument::ReloadFlag flag, Core::IDocument::ChangeType type)
+{
+    Q_UNUSED(errorString);
+    Q_UNUSED(flag);
+
+    if (type != TypePermissions)
+        m_project->handleCmakeFileChanged();
+    return true;
+}
+
 } // namespace Internal
 } // namespace CMakeProjectManager
diff --git a/src/plugins/cmakeprojectmanager/cmakefile.h b/src/plugins/cmakeprojectmanager/cmakefile.h
index e5018ce7315..606012ea244 100644
--- a/src/plugins/cmakeprojectmanager/cmakefile.h
+++ b/src/plugins/cmakeprojectmanager/cmakefile.h
@@ -35,9 +35,13 @@ namespace Internal {
 class CMakeFile : public Core::IDocument
 {
 public:
-    CMakeFile(const Utils::FileName &fileName);
+    CMakeFile(CMakeProject *project, const Utils::FileName &fileName);
 
     ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const override;
+    bool reload(QString *errorString, ReloadFlag flag, ChangeType type) override;
+
+private:
+    CMakeProject *m_project;
 };
 
 } // namespace Internal
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.cpp b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
index e7c78ab01df..bb09ec627a5 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
@@ -36,6 +36,7 @@
 #include "cmakeprojectmanager.h"
 
 #include <coreplugin/icore.h>
+#include <coreplugin/documentmanager.h>
 #include <cpptools/cppmodelmanager.h>
 #include <cpptools/projectinfo.h>
 #include <cpptools/projectpartbuilder.h>
@@ -88,11 +89,13 @@ CMakeProject::CMakeProject(CMakeManager *manager, const FileName &fileName)
 {
     setId(Constants::CMAKEPROJECT_ID);
     setProjectManager(manager);
-    setDocument(new CMakeFile(fileName));
+    setDocument(new Internal::CMakeFile(this, fileName));
+
     setRootProjectNode(new CMakeProjectNode(fileName));
     setProjectContext(Core::Context(CMakeProjectManager::Constants::PROJECTCONTEXT));
     setProjectLanguages(Core::Context(ProjectExplorer::Constants::LANG_CXX));
 
+    Core::DocumentManager::addDocument(document());
     rootProjectNode()->setDisplayName(fileName.parentDir().fileName());
 
     connect(this, &CMakeProject::activeTargetChanged, this, &CMakeProject::handleActiveTargetChanged);
@@ -217,6 +220,29 @@ void CMakeProject::parseCMakeOutput()
 
     rootProjectNode()->setDisplayName(bdm->projectName());
 
+    // Delete no longer necessary file watcher:
+    const QSet<Utils::FileName> currentWatched
+            = Utils::transform(m_watchedFiles, [](CMakeFile *cmf) { return cmf->filePath(); });
+    const QSet<Utils::FileName> toWatch = bdm->cmakeFiles();
+    QSet<Utils::FileName> toDelete = currentWatched;
+    toDelete.subtract(toWatch);
+    m_watchedFiles = Utils::filtered(m_watchedFiles, [&toDelete](Internal::CMakeFile *cmf) {
+            if (toDelete.contains(cmf->filePath())) {
+                delete cmf;
+                return false;
+            }
+            return true;
+        });
+
+    // Add new file watchers:
+    QSet<Utils::FileName> toAdd = toWatch;
+    toAdd.subtract(currentWatched);
+    foreach (const Utils::FileName &fn, toAdd) {
+        CMakeFile *cm = new CMakeFile(this, fn);
+        Core::DocumentManager::addDocument(cm);
+        m_watchedFiles.insert(cm);
+    }
+
     buildTree(static_cast<CMakeProjectNode *>(rootProjectNode()), bdm->files());
     bdm->clearFiles(); // Some of the FileNodes in files() were deleted!
 
@@ -512,6 +538,15 @@ bool CMakeProject::setupTarget(Target *t)
     return true;
 }
 
+void CMakeProject::handleCmakeFileChanged()
+{
+    if (Target *t = activeTarget()) {
+        if (auto bc = qobject_cast<CMakeBuildConfiguration *>(t->activeBuildConfiguration())) {
+            bc->cmakeFilesChanged();
+        }
+    }
+}
+
 void CMakeProject::handleActiveTargetChanged()
 {
     if (m_connectedTarget) {
diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.h b/src/plugins/cmakeprojectmanager/cmakeproject.h
index 38126f5f9aa..27e07d8f073 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.h
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.h
@@ -120,6 +120,8 @@ protected:
     bool setupTarget(ProjectExplorer::Target *t) override;
 
 private:
+    void handleCmakeFileChanged();
+
     void handleActiveTargetChanged();
     void handleActiveBuildConfigurationChanged();
     void handleParsingStarted();
@@ -144,7 +146,10 @@ private:
     QFuture<void> m_codeModelFuture;
     QList<ProjectExplorer::ExtraCompiler *> m_extraCompilers;
 
+    QSet<Internal::CMakeFile *> m_watchedFiles;
+
     friend class Internal::CMakeBuildConfiguration;
+    friend class Internal::CMakeFile;
 };
 
 } // namespace CMakeProjectManager