diff --git a/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.cpp b/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.cpp
index c216ee320ba..04bd26476e2 100644
--- a/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.cpp
+++ b/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.cpp
@@ -317,11 +317,6 @@ QString QmlProjectItem::mainFile() const
     return m_project["runConfig"].toObject()["mainFile"].toString();
 }
 
-Utils::FilePath QmlProjectItem::mainFilePath() const
-{
-    return m_projectFile;
-}
-
 void QmlProjectItem::setMainUiFile(const QString &mainUiFile)
 {
     QJsonObject runConfig = m_project["runConfig"].toObject();
@@ -334,11 +329,6 @@ QString QmlProjectItem::mainUiFile() const
     return m_project["runConfig"].toObject()["mainUiFile"].toString();
 }
 
-Utils::FilePath QmlProjectItem::mainUiFilePath() const
-{
-    return Utils::FilePath::fromString(m_project["runConfig"].toObject()["mainUiFile"].toString());
-}
-
 bool QmlProjectItem::widgetApp() const
 {
     return m_project["runConfig"].toObject()["widgetApp"].toBool();
diff --git a/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.h b/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.h
index 30e85d53dcd..78b038b0378 100644
--- a/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.h
+++ b/src/plugins/qmlprojectmanager/buildsystem/projectitem/qmlprojectitem.h
@@ -69,11 +69,9 @@ public:
 
     void setMainFile(const QString &mainFile);
     QString mainFile() const;
-    Utils::FilePath mainFilePath() const;
 
     void setMainUiFile(const QString &mainUiFile);
     QString mainUiFile() const;
-    Utils::FilePath mainUiFilePath() const;
 
     bool widgetApp() const;
     void setWidgetApp(const bool &widgetApp);
diff --git a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp
index e06ac211dfb..712aef92277 100644
--- a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp
+++ b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.cpp
@@ -291,7 +291,7 @@ Utils::FilePath QmlBuildSystem::mainFilePath() const
 
 Utils::FilePath QmlBuildSystem::mainUiFilePath() const
 {
-    return m_projectItem->mainUiFilePath();
+    return projectDirectory().pathAppended(mainUiFile());
 }
 
 bool QmlBuildSystem::setMainFileInProjectFile(const Utils::FilePath &newMainFilePath)
@@ -477,6 +477,11 @@ QString QmlBuildSystem::mainFile() const
     return m_projectItem->mainFile();
 }
 
+QString QmlBuildSystem::mainUiFile() const
+{
+    return m_projectItem->mainUiFile();
+}
+
 bool QmlBuildSystem::qtForMCUs() const
 {
     return m_projectItem->isQt4McuProject();
diff --git a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h
index 914b8d4c0fe..d275481f537 100644
--- a/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h
+++ b/src/plugins/qmlprojectmanager/buildsystem/qmlbuildsystem.h
@@ -57,6 +57,7 @@ public:
 
     Utils::FilePath canonicalProjectDir() const;
     QString mainFile() const;
+    QString mainUiFile() const;
     Utils::FilePath mainFilePath() const;
     Utils::FilePath mainUiFilePath() const;