diff --git a/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp b/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
index 4c503b11587a2d2bcfadf87d361431416536e3cc..f5928949ec8e50c10705e4a577d8f8f01a0acfe2 100644
--- a/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
+++ b/src/plugins/qmakeprojectmanager/qmakeparsernodes.cpp
@@ -1961,7 +1961,7 @@ QString QmakeProFile::sourceDir() const
 
 QString QmakeProFile::buildDir(QmakeBuildConfiguration *bc) const
 {
-    const QDir srcDirRoot = m_project->rootProjectNode()->sourceDir();
+    const QDir srcDirRoot = QDir(m_project->projectDirectory().toString());
     const QString relativeDir = srcDirRoot.relativeFilePath(directoryPath().toString());
     if (!bc && m_project->activeTarget())
         bc = static_cast<QmakeBuildConfiguration *>(m_project->activeTarget()->activeBuildConfiguration());