diff --git a/src/plugins/mesonprojectmanager/buildoptionsparser.h b/src/plugins/mesonprojectmanager/buildoptionsparser.h
index ce2c927118f..4564269f12f 100644
--- a/src/plugins/mesonprojectmanager/buildoptionsparser.h
+++ b/src/plugins/mesonprojectmanager/buildoptionsparser.h
@@ -7,6 +7,8 @@
 #include "common.h"
 #include "mesonpluginconstants.h"
 
+#include <utils/filepath.h>
+
 #include <QFile>
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -72,15 +74,14 @@ class BuildOptionsParser
     std::vector<std::unique_ptr<BuildOption>> m_buildOptions;
 
 public:
-    BuildOptionsParser(const QString &buildDir)
+    BuildOptionsParser(const Utils::FilePath &buildDir)
     {
-        auto arr = load<QJsonArray>(QString("%1/%2/%3")
-                                        .arg(buildDir)
-                                        .arg(Constants::MESON_INFO_DIR)
-                                        .arg(Constants::MESON_INTRO_BUIDOPTIONS));
+        Utils::FilePath path = buildDir / Constants::MESON_INFO_DIR / Constants::MESON_INTRO_BUIDOPTIONS;
+        auto arr = load<QJsonArray>(path.toFSPathString());
         if (arr)
             m_buildOptions = load_options(*arr);
     }
+
     BuildOptionsParser(const QJsonDocument &js)
     {
         auto obj = get<QJsonArray>(js.object(), "buildoptions");
diff --git a/src/plugins/mesonprojectmanager/buildsystemfilesparser.h b/src/plugins/mesonprojectmanager/buildsystemfilesparser.h
index 3bd8249c3ab..a64dd0c63c7 100644
--- a/src/plugins/mesonprojectmanager/buildsystemfilesparser.h
+++ b/src/plugins/mesonprojectmanager/buildsystemfilesparser.h
@@ -32,12 +32,10 @@ class BuildSystemFilesParser
     }
 
 public:
-    BuildSystemFilesParser(const QString &buildDir)
+    BuildSystemFilesParser(const Utils::FilePath &buildDir)
     {
-        auto arr = load<QJsonArray>(QString("%1/%2/%3")
-                                        .arg(buildDir)
-                                        .arg(Constants::MESON_INFO_DIR)
-                                        .arg(Constants::MESON_INTRO_BUILDSYSTEM_FILES));
+        Utils::FilePath path = buildDir / Constants::MESON_INFO_DIR / Constants::MESON_INTRO_BUILDSYSTEM_FILES;
+        auto arr = load<QJsonArray>(path.toFSPathString());
         appendFiles(arr, m_files);
     }
 
diff --git a/src/plugins/mesonprojectmanager/infoparser.h b/src/plugins/mesonprojectmanager/infoparser.h
index 27845a51490..6aca6211ea4 100644
--- a/src/plugins/mesonprojectmanager/infoparser.h
+++ b/src/plugins/mesonprojectmanager/infoparser.h
@@ -30,20 +30,14 @@ class InfoParser
     MesonInfo m_info;
 
 public:
-    InfoParser(const QString &buildDir)
-    /*: AbstractParser(jsonFile(buildDir))*/
+    InfoParser(const Utils::FilePath &buildDir)
     {
-        auto obj = load<QJsonObject>(jsonFile(buildDir));
+        Utils::FilePath jsonFile = buildDir / Constants::MESON_INFO_DIR / Constants::MESON_INFO;
+        auto obj = load<QJsonObject>(jsonFile.toFSPathString());
         if (obj)
             m_info = load_info(*obj);
     }
-    static inline QString jsonFile(const QString &buildDir)
-    {
-        return QString("%1/%2/%3")
-            .arg(buildDir)
-            .arg(Constants::MESON_INFO_DIR)
-            .arg(Constants::MESON_INFO);
-    }
+
     MesonInfo info() { return m_info; }
 };
 
diff --git a/src/plugins/mesonprojectmanager/mesoninfoparser.h b/src/plugins/mesonprojectmanager/mesoninfoparser.h
index f32220f48b5..768ed13cf2e 100644
--- a/src/plugins/mesonprojectmanager/mesoninfoparser.h
+++ b/src/plugins/mesonprojectmanager/mesoninfoparser.h
@@ -11,7 +11,7 @@
 #include "target.h"
 #include "targetparser.h"
 
-#include <utils/fileutils.h>
+#include <utils/filepath.h>
 
 #include <optional>
 
@@ -30,7 +30,7 @@ struct Result
     std::optional<MesonInfo> mesonInfo;
 };
 
-inline Result parse(const QString &buildDir)
+inline Result parse(const Utils::FilePath &buildDir)
 {
     return {TargetParser{buildDir}.targetList(),
             BuildOptionsParser{buildDir}.takeBuildOptions(),
@@ -58,7 +58,8 @@ inline Result parse(QIODevice *introFile)
     }
     return {};
 }
-inline std::optional<MesonInfo> mesonInfo(const QString &buildDir)
+
+inline std::optional<MesonInfo> mesonInfo(const Utils::FilePath &buildDir)
 {
     return InfoParser{buildDir}.info();
 }
diff --git a/src/plugins/mesonprojectmanager/mesonprojectparser.cpp b/src/plugins/mesonprojectmanager/mesonprojectparser.cpp
index c84b5e4b3d6..20f3316d904 100644
--- a/src/plugins/mesonprojectmanager/mesonprojectparser.cpp
+++ b/src/plugins/mesonprojectmanager/mesonprojectparser.cpp
@@ -200,7 +200,7 @@ bool MesonProjectParser::startParser()
     m_parserFutureResult = Utils::asyncRun(
                 ProjectExplorer::ProjectExplorerPlugin::sharedThreadPool(),
                 [processOutput = m_process.stdOut(), introType = m_introType,
-                buildDir = m_buildDir.toString(), srcDir = m_srcDir] {
+                buildDir = m_buildDir, srcDir = m_srcDir] {
         if (introType == IntroDataType::file)
             return extractParserResults(srcDir, MesonInfoParser::parse(buildDir));
         else
@@ -323,7 +323,7 @@ bool MesonProjectParser::matchesKit(const KitData &kit)
 
 bool MesonProjectParser::usesSameMesonVersion(const Utils::FilePath &buildPath)
 {
-    auto info = MesonInfoParser::mesonInfo(buildPath.toString());
+    auto info = MesonInfoParser::mesonInfo(buildPath);
     auto meson = MesonTools::mesonWrapper(m_meson);
     return info && meson && info->mesonVersion == meson->version();
 }
diff --git a/src/plugins/mesonprojectmanager/targetparser.h b/src/plugins/mesonprojectmanager/targetparser.h
index 2b31083ba26..9c88b12b267 100644
--- a/src/plugins/mesonprojectmanager/targetparser.h
+++ b/src/plugins/mesonprojectmanager/targetparser.h
@@ -63,12 +63,10 @@ class TargetParser
     }
 
 public:
-    TargetParser(const QString &buildDir)
+    TargetParser(const Utils::FilePath &buildDir)
     {
-        auto arr = load<QJsonArray>(QString("%1/%2/%3")
-                                        .arg(buildDir)
-                                        .arg(Constants::MESON_INFO_DIR)
-                                        .arg(Constants::MESON_INTRO_TARGETS));
+        Utils::FilePath path = buildDir / Constants::MESON_INFO_DIR / Constants::MESON_INTRO_TARGETS;
+        auto arr = load<QJsonArray>(path.toFSPathString());
         if (arr)
             m_targets = load_targets(*arr);
     }
diff --git a/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp b/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp
index f45b59c86f3..37051b7ecdc 100644
--- a/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp
+++ b/src/plugins/mesonprojectmanager/tests/testmesoninfoparser.cpp
@@ -19,6 +19,7 @@
 #include <iostream>
 
 using namespace MesonProjectManager::Internal;
+using namespace Utils;
 
 struct projectData
 {
@@ -27,22 +28,9 @@ struct projectData
     QStringList targets;
 };
 
-namespace {
 static const QList<projectData> projectList{
     {"Simple C Project", "simplecproject", {"SimpleCProject"}}};
-} // namespace
 
-#define WITH_CONFIGURED_PROJECT(_source_dir, _build_dir, ...) \
-    { \
-        QTemporaryDir _build_dir{"test-meson"}; \
-        const auto tool = MesonWrapper::find(); \
-        QVERIFY(tool.has_value()); \
-        const auto _meson = MesonWrapper("name", *tool); \
-        run_meson(_meson.setup(Utils::FilePath::fromString(_source_dir), \
-                               Utils::FilePath::fromString(_build_dir.path()))); \
-        QVERIFY(isSetup(Utils::FilePath::fromString(_build_dir.path()))); \
-        __VA_ARGS__ \
-    }
 
 #define WITH_UNCONFIGURED_PROJECT(_source_dir, _intro_file, ...) \
     { \
@@ -86,15 +74,24 @@ private slots:
     {
         QFETCH(QString, src_dir);
         QFETCH(QStringList, expectedTargets);
-        WITH_CONFIGURED_PROJECT(src_dir, build_dir, {
-            auto result = MesonInfoParser::parse(build_dir.path());
+
+        {
+            QTemporaryDir build_dir{"test-meson"};
+            FilePath buildDir = FilePath::fromString(build_dir.path());
+            const auto tool = MesonWrapper::find();
+            QVERIFY(tool.has_value());
+            MesonWrapper meson("name", *tool);
+            run_meson(meson.setup(FilePath::fromString(src_dir), buildDir));
+            QVERIFY(isSetup(buildDir));
+
+            auto result = MesonInfoParser::parse(buildDir);
             QStringList targetsNames;
             std::transform(std::cbegin(result.targets),
                            std::cend(result.targets),
                            std::back_inserter(targetsNames),
                            [](const auto &target) { return target.name; });
             QVERIFY(targetsNames == expectedTargets);
-        })
+        }
 
         WITH_UNCONFIGURED_PROJECT(src_dir, introFile, {
             auto result = MesonInfoParser::parse(&introFile);