diff --git a/tests/unit/unittest/projectupdater-test.cpp b/tests/unit/unittest/projectupdater-test.cpp
index 960a2564697..ea1c14dc353 100644
--- a/tests/unit/unittest/projectupdater-test.cpp
+++ b/tests/unit/unittest/projectupdater-test.cpp
@@ -86,7 +86,7 @@ protected:
 
     void SetUp() override
     {
-        project.rootProjectDirectoryPath.pathAppended("project");
+        project.rootProjectDirectoryPath = Utils::FilePath::fromString("project");
         projectPart.project = &project;
         projectPart.files.push_back(header1ProjectFile);
         projectPart.files.push_back(header2ProjectFile);