diff --git a/src/plugins/clangcodemodel/clangdcompletion.cpp b/src/plugins/clangcodemodel/clangdcompletion.cpp
index 5bcf6a9f26f..e37cf293deb 100644
--- a/src/plugins/clangcodemodel/clangdcompletion.cpp
+++ b/src/plugins/clangcodemodel/clangdcompletion.cpp
@@ -608,7 +608,7 @@ QList<AssistProposalItemInterface *> ClangdCompletionAssistProcessor::generateCo
         return itemGenerator(items);
     const QString content = doc->toPlainText();
     const bool requiresSignal = CppModelManager::instance()->getSignalSlotType(
-                filePath().toString(), content.toUtf8(), pos)
+                filePath(), content.toUtf8(), pos)
             == SignalSlotType::NewStyleSignal;
     if (requiresSignal)
         return itemGenerator(Utils::filtered(items, criterion));
diff --git a/src/plugins/cppeditor/cppeditorwidget.cpp b/src/plugins/cppeditor/cppeditorwidget.cpp
index 428d680a398..15a0695d3c2 100644
--- a/src/plugins/cppeditor/cppeditorwidget.cpp
+++ b/src/plugins/cppeditor/cppeditorwidget.cpp
@@ -1165,9 +1165,7 @@ bool CppEditorWidget::isOldStyleSignalOrSlot() const
     const QString content = textDocument()->plainText();
 
     return CppEditor::CppModelManager::instance()
-               ->getSignalSlotType(textDocument()->filePath().toString(),
-                                        content.toUtf8(),
-                                        tc.position())
+               ->getSignalSlotType(textDocument()->filePath(), content.toUtf8(), tc.position())
            == CppEditor::SignalSlotType::OldStyleSignal;
 }
 
diff --git a/src/plugins/cppeditor/cppmodelmanager.cpp b/src/plugins/cppeditor/cppmodelmanager.cpp
index b71535f9e6b..a53c04ee681 100644
--- a/src/plugins/cppeditor/cppmodelmanager.cpp
+++ b/src/plugins/cppeditor/cppmodelmanager.cpp
@@ -92,6 +92,7 @@ static const bool DumpProjectInfo = qgetenv("QTC_DUMP_PROJECT_INFO") == "1";
 
 using namespace CPlusPlus;
 using namespace ProjectExplorer;
+using namespace Utils;
 
 #ifdef QTCREATOR_WITH_DUMP_AST
 
@@ -357,7 +358,7 @@ int argumentPositionOf(const AST *last, const CallAST *callAst)
     return 0;
 }
 
-SignalSlotType CppModelManager::getSignalSlotType(const QString &filePath,
+SignalSlotType CppModelManager::getSignalSlotType(const FilePath &filePath,
                                                   const QByteArray &content,
                                                   int position) const
 {
@@ -371,8 +372,7 @@ SignalSlotType CppModelManager::getSignalSlotType(const QString &filePath,
         fixedContent.insert(position, 'x');
 
     const Snapshot snapshot = this->snapshot();
-    const Document::Ptr document = snapshot.preprocessedDocument(fixedContent,
-                                                                 Utils::FilePath::fromString(filePath));
+    const Document::Ptr document = snapshot.preprocessedDocument(fixedContent, filePath);
     document->check();
     QTextDocument textDocument(QString::fromUtf8(fixedContent));
     QTextCursor cursor(&textDocument);
diff --git a/src/plugins/cppeditor/cppmodelmanager.h b/src/plugins/cppeditor/cppmodelmanager.h
index 2572c2398a0..32f5db07170 100644
--- a/src/plugins/cppeditor/cppmodelmanager.h
+++ b/src/plugins/cppeditor/cppmodelmanager.h
@@ -166,7 +166,7 @@ public:
 
     QList<int> references(CPlusPlus::Symbol *symbol, const CPlusPlus::LookupContext &context);
 
-    SignalSlotType getSignalSlotType(const QString &filePath,
+    SignalSlotType getSignalSlotType(const Utils::FilePath &filePath,
                                      const QByteArray &content,
                                      int position) const;