diff --git a/src/plugins/python/pyside.cpp b/src/plugins/python/pyside.cpp
index 5dfa1065a15..6965305f2e6 100644
--- a/src/plugins/python/pyside.cpp
+++ b/src/plugins/python/pyside.cpp
@@ -60,16 +60,16 @@ PySideInstaller *PySideInstaller::instance()
     return instance;
 }
 
-void PySideInstaller::checkPySideInstallation(const Utils::FilePath &python,
+void PySideInstaller::checkPySideInstallation(const FilePath &python,
                                               TextEditor::TextDocument *document)
 {
     document->infoBar()->removeInfo(installPySideInfoBarId);
     const QString pySide = importedPySide(document->plainText());
     if (pySide == "PySide2" || pySide == "PySide6")
-        runPySideChecker(python, pySide, document);
+        instance()->runPySideChecker(python, pySide, document);
 }
 
-bool PySideInstaller::missingPySideInstallation(const Utils::FilePath &pythonPath,
+bool PySideInstaller::missingPySideInstallation(const FilePath &pythonPath,
                                                 const QString &pySide)
 {
     QTC_ASSERT(!pySide.isEmpty(), return false);
@@ -78,8 +78,7 @@ bool PySideInstaller::missingPySideInstallation(const Utils::FilePath &pythonPat
         return false;
 
     QtcProcess pythonProcess;
-    const CommandLine importPySideCheck(pythonPath, {"-c", "import " + pySide});
-    pythonProcess.setCommand(importPySideCheck);
+    pythonProcess.setCommand({pythonPath, {"-c", "import " + pySide}});
     pythonProcess.runBlocking();
     const bool missing = pythonProcess.result() != ProcessResult::FinishedWithSuccess;
     if (!missing)
diff --git a/src/plugins/python/pyside.h b/src/plugins/python/pyside.h
index c440ca34240..5df33f31bb1 100644
--- a/src/plugins/python/pyside.h
+++ b/src/plugins/python/pyside.h
@@ -40,9 +40,11 @@ namespace Internal {
 class PySideInstaller : public QObject
 {
     Q_DECLARE_TR_FUNCTIONS(Python::Internal::PySideInstaller)
+
 public:
     static PySideInstaller *instance();
-    void checkPySideInstallation(const Utils::FilePath &python, TextEditor::TextDocument *document);
+    static void checkPySideInstallation(const Utils::FilePath &python,
+                                        TextEditor::TextDocument *document);
 
 private:
     PySideInstaller();
diff --git a/src/plugins/python/pythoneditor.cpp b/src/plugins/python/pythoneditor.cpp
index 6344e52f9b0..562f69f5d72 100644
--- a/src/plugins/python/pythoneditor.cpp
+++ b/src/plugins/python/pythoneditor.cpp
@@ -118,8 +118,8 @@ public:
         if (!python.exists())
             return;
 
-        PyLSConfigureAssistant::instance()->openDocumentWithPython(python, this);
-        PySideInstaller::instance()->checkPySideInstallation(python, this);
+        PyLSConfigureAssistant::openDocumentWithPython(python, this);
+        PySideInstaller::checkPySideInstallation(python, this);
     }
 };
 
diff --git a/src/plugins/python/pythonlanguageclient.cpp b/src/plugins/python/pythonlanguageclient.cpp
index bf131a73c1f..76e6fc2cb37 100644
--- a/src/plugins/python/pythonlanguageclient.cpp
+++ b/src/plugins/python/pythonlanguageclient.cpp
@@ -614,7 +614,7 @@ void PyLSConfigureAssistant::openDocumentWithPython(const FilePath &python,
     QPointer<CheckPylsWatcher> watcher = new CheckPylsWatcher();
 
     // cancel and delete watcher after a 10 second timeout
-    QTimer::singleShot(10000, this, [watcher]() {
+    QTimer::singleShot(10000, instance(), [watcher]() {
         if (watcher) {
             watcher->cancel();
             watcher->deleteLater();
@@ -623,11 +623,11 @@ void PyLSConfigureAssistant::openDocumentWithPython(const FilePath &python,
 
     connect(watcher,
             &CheckPylsWatcher::resultReadyAt,
-            this,
+            instance(),
             [=, document = QPointer<TextEditor::TextDocument>(document)]() {
                 if (!document || !watcher)
                     return;
-                handlePyLSState(python, watcher->result(), document);
+                instance()->handlePyLSState(python, watcher->result(), document);
                 watcher->deleteLater();
             });
     watcher->setFuture(Utils::runAsync(&checkPythonLanguageServer, python));
diff --git a/src/plugins/python/pythonlanguageclient.h b/src/plugins/python/pythonlanguageclient.h
index 645583a2374..4109fd4a8cd 100644
--- a/src/plugins/python/pythonlanguageclient.h
+++ b/src/plugins/python/pythonlanguageclient.h
@@ -71,9 +71,11 @@ public:
 
     static const LanguageClient::StdIOSettings *languageServerForPython(
         const Utils::FilePath &python);
-    static void updateEditorInfoBars(const Utils::FilePath &python, LanguageClient::Client *client);
 
-    void openDocumentWithPython(const Utils::FilePath &python, TextEditor::TextDocument *document);
+    static void updateEditorInfoBars(const Utils::FilePath &python,
+                                     LanguageClient::Client *client);
+    static void openDocumentWithPython(const Utils::FilePath &python,
+                                       TextEditor::TextDocument *document);
 
 private:
     explicit PyLSConfigureAssistant(QObject *parent);
diff --git a/src/plugins/python/pythonrunconfiguration.cpp b/src/plugins/python/pythonrunconfiguration.cpp
index 6087ce77d80..e3a100486d6 100644
--- a/src/plugins/python/pythonrunconfiguration.cpp
+++ b/src/plugins/python/pythonrunconfiguration.cpp
@@ -152,8 +152,8 @@ public:
             for (FilePath &file : project()->files(Project::AllFiles)) {
                 if (auto document = TextEditor::TextDocument::textDocumentForFilePath(file)) {
                     if (document->mimeType() == Constants::C_PY_MIMETYPE) {
-                        PyLSConfigureAssistant::instance()->openDocumentWithPython(python, document);
-                        PySideInstaller::instance()->checkPySideInstallation(python, document);
+                        PyLSConfigureAssistant::openDocumentWithPython(python, document);
+                        PySideInstaller::checkPySideInstallation(python, document);
                     }
                 }
             }