diff --git a/src/plugins/cmakeprojectmanager/cmakebuildstep.cpp b/src/plugins/cmakeprojectmanager/cmakebuildstep.cpp
index 1608a454d60..875971a1cfa 100644
--- a/src/plugins/cmakeprojectmanager/cmakebuildstep.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakebuildstep.cpp
@@ -300,7 +300,7 @@ void CMakeBuildStep::setupOutputFormatter(Utils::OutputFormatter *formatter)
         emit progress(percent, {});
     });
     formatter->addLineParser(progressParser);
-    cmakeParser->setSourceDirectory(project()->projectDirectory().toString());
+    cmakeParser->setSourceDirectory(project()->projectDirectory());
     formatter->addLineParsers({cmakeParser, new GnuMakeParser});
     ToolChain *tc = ToolChainKitAspect::cxxToolChain(kit());
     OutputTaskParser *xcodeBuildParser = nullptr;
diff --git a/src/plugins/cmakeprojectmanager/cmakeparser.cpp b/src/plugins/cmakeprojectmanager/cmakeparser.cpp
index e4a1c7b093e..1b6573869dc 100644
--- a/src/plugins/cmakeprojectmanager/cmakeparser.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeparser.cpp
@@ -32,12 +32,19 @@ CMakeParser::CMakeParser()
     QTC_CHECK(m_locationLine.isValid());
 }
 
-void CMakeParser::setSourceDirectory(const QString &sourceDir)
+void CMakeParser::setSourceDirectory(const FilePath &sourceDir)
 {
     if (m_sourceDirectory)
-        emit searchDirExpired(FilePath::fromString(m_sourceDirectory.value().path()));
-    m_sourceDirectory = QDir(sourceDir);
-    emit newSearchDirFound(FilePath::fromString(sourceDir));
+        emit searchDirExpired(m_sourceDirectory.value());
+    m_sourceDirectory = sourceDir;
+    emit newSearchDirFound(sourceDir);
+}
+
+FilePath CMakeParser::resolvePath(const QString &path) const
+{
+    if (m_sourceDirectory)
+        return m_sourceDirectory->resolvePath(path);
+    return FilePath::fromUserInput(path);
 }
 
 OutputLineParser::Result CMakeParser::handleLine(const QString &line, OutputFormat type)
@@ -69,12 +76,11 @@ OutputLineParser::Result CMakeParser::handleLine(const QString &line, OutputForm
 
         match = m_commonError.match(trimmedLine);
         if (match.hasMatch()) {
-            QString path = m_sourceDirectory ? m_sourceDirectory->absoluteFilePath(
-                               QDir::fromNativeSeparators(match.captured(1)))
-                                             : QDir::fromNativeSeparators(match.captured(1));
+            const FilePath path = resolvePath(match.captured(1));
+
             m_lastTask = BuildSystemTask(Task::Error,
                                          QString(),
-                                         absoluteFilePath(FilePath::fromUserInput(path)),
+                                         absoluteFilePath(path),
                                          match.captured(2).toInt());
             m_lines = 1;
             LinkSpecs linkSpecs;
@@ -94,12 +100,10 @@ OutputLineParser::Result CMakeParser::handleLine(const QString &line, OutputForm
         }
         match = m_commonWarning.match(trimmedLine);
         if (match.hasMatch()) {
-            QString path = m_sourceDirectory ? m_sourceDirectory->absoluteFilePath(
-                               QDir::fromNativeSeparators(match.captured(2)))
-                                             : QDir::fromNativeSeparators(match.captured(2));
+            const FilePath path = resolvePath(match.captured(2));
             m_lastTask = BuildSystemTask(Task::Warning,
                                          QString(),
-                                         absoluteFilePath(FilePath::fromUserInput(path)),
+                                         absoluteFilePath(path),
                                          match.captured(3).toInt());
             m_lines = 1;
             LinkSpecs linkSpecs;
diff --git a/src/plugins/cmakeprojectmanager/cmakeparser.h b/src/plugins/cmakeprojectmanager/cmakeparser.h
index 686840575ee..e9d28b78e75 100644
--- a/src/plugins/cmakeprojectmanager/cmakeparser.h
+++ b/src/plugins/cmakeprojectmanager/cmakeparser.h
@@ -8,7 +8,8 @@
 #include <projectexplorer/ioutputparser.h>
 #include <projectexplorer/task.h>
 
-#include <QDir>
+#include <utils/filepath.h>
+
 #include <QRegularExpression>
 
 #include <optional>
@@ -21,17 +22,18 @@ class CMAKE_EXPORT CMakeParser : public ProjectExplorer::OutputTaskParser
 
 public:
     explicit CMakeParser();
-    void setSourceDirectory(const QString &sourceDir);
+    void setSourceDirectory(const Utils::FilePath &sourceDir);
 
 private:
     Result handleLine(const QString &line, Utils::OutputFormat type) override;
     void flush() override;
+    Utils::FilePath resolvePath(const QString &path) const;
 
     enum TripleLineError { NONE, LINE_LOCATION, LINE_DESCRIPTION, LINE_DESCRIPTION2 };
 
     TripleLineError m_expectTripleLineErrorData = NONE;
 
-    std::optional<QDir> m_sourceDirectory;
+    std::optional<Utils::FilePath> m_sourceDirectory;
     ProjectExplorer::Task m_lastTask;
     QRegularExpression m_commonError;
     QRegularExpression m_nextSubError;
@@ -41,4 +43,4 @@ private:
     int m_lines = 0;
 };
 
-} // namespace CMakeProjectManager
+} // CMakeProjectManager
diff --git a/src/plugins/cmakeprojectmanager/cmakeprocess.cpp b/src/plugins/cmakeprojectmanager/cmakeprocess.cpp
index ce089733632..4960b2e5c09 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprocess.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprocess.cpp
@@ -97,7 +97,7 @@ void CMakeProcess::run(const BuildDirParameters &parameters, const QStringList &
     }
 
     const auto parser = new CMakeParser;
-    parser->setSourceDirectory(parameters.sourceDirectory.path());
+    parser->setSourceDirectory(parameters.sourceDirectory);
     m_parser.addLineParser(parser);
 
     // Always use the sourceDir: If we are triggered because the build directory is getting deleted