diff --git a/src/plugins/coreplugin/locator/basefilefilter.h b/src/plugins/coreplugin/locator/basefilefilter.h
index 44102b30e4e..b8e95dc06f0 100644
--- a/src/plugins/coreplugin/locator/basefilefilter.h
+++ b/src/plugins/coreplugin/locator/basefilefilter.h
@@ -46,6 +46,7 @@ public:
     void accept(Core::LocatorFilterEntry selection) const;
 
 protected:
+    // runs in non-UI thread
     virtual void updateFiles();
     void generateFileNames();
 
diff --git a/src/plugins/projectexplorer/allprojectsfilter.cpp b/src/plugins/projectexplorer/allprojectsfilter.cpp
index fd4b44e9ed3..6972b25daa7 100644
--- a/src/plugins/projectexplorer/allprojectsfilter.cpp
+++ b/src/plugins/projectexplorer/allprojectsfilter.cpp
@@ -55,16 +55,21 @@ void AllProjectsFilter::markFilesAsOutOfDate()
     m_filesUpToDate = false;
 }
 
-void AllProjectsFilter::updateFiles()
+void AllProjectsFilter::updateFilesImpl()
 {
     if (m_filesUpToDate)
         return;
-    m_filesUpToDate = true;
     files().clear();
     foreach (Project *project, SessionManager::projects())
         files().append(project->files(Project::AllFiles));
     Utils::sort(files());
     generateFileNames();
+    m_filesUpToDate = true;
+}
+
+void AllProjectsFilter::updateFiles()
+{
+    QMetaObject::invokeMethod(this, "updateFilesImpl", Qt::BlockingQueuedConnection);
 }
 
 void AllProjectsFilter::refresh(QFutureInterface<void> &future)
diff --git a/src/plugins/projectexplorer/allprojectsfilter.h b/src/plugins/projectexplorer/allprojectsfilter.h
index 0e5b79b5617..1d12e6d54d0 100644
--- a/src/plugins/projectexplorer/allprojectsfilter.h
+++ b/src/plugins/projectexplorer/allprojectsfilter.h
@@ -50,6 +50,7 @@ protected:
 
 private slots:
     void markFilesAsOutOfDate();
+    void updateFilesImpl();
 
 private:
     bool m_filesUpToDate;
diff --git a/src/plugins/projectexplorer/currentprojectfilter.cpp b/src/plugins/projectexplorer/currentprojectfilter.cpp
index 50917bb598f..2a04772e98b 100644
--- a/src/plugins/projectexplorer/currentprojectfilter.cpp
+++ b/src/plugins/projectexplorer/currentprojectfilter.cpp
@@ -57,17 +57,22 @@ void CurrentProjectFilter::markFilesAsOutOfDate()
     m_filesUpToDate = false;
 }
 
-void CurrentProjectFilter::updateFiles()
+void CurrentProjectFilter::updateFilesImpl()
 {
     if (m_filesUpToDate)
         return;
-    m_filesUpToDate = true;
     files().clear();
     if (!m_project)
         return;
     files() = m_project->files(Project::AllFiles);
     Utils::sort(files());
     generateFileNames();
+    m_filesUpToDate = true;
+}
+
+void CurrentProjectFilter::updateFiles()
+{
+    QMetaObject::invokeMethod(this, "updateFilesImpl", Qt::BlockingQueuedConnection);
 }
 
 void CurrentProjectFilter::currentProjectChanged(ProjectExplorer::Project *project)
diff --git a/src/plugins/projectexplorer/currentprojectfilter.h b/src/plugins/projectexplorer/currentprojectfilter.h
index 25fe85a8acc..f1a9a5f682a 100644
--- a/src/plugins/projectexplorer/currentprojectfilter.h
+++ b/src/plugins/projectexplorer/currentprojectfilter.h
@@ -54,6 +54,7 @@ protected:
 private slots:
     void currentProjectChanged(ProjectExplorer::Project *project);
     void markFilesAsOutOfDate();
+    void updateFilesImpl();
 
 private:
     Project *m_project;