diff --git a/src/plugins/mcusupport/mcusupportoptions.cpp b/src/plugins/mcusupport/mcusupportoptions.cpp
index ea7c8acac1c..6fa37d5a83b 100644
--- a/src/plugins/mcusupport/mcusupportoptions.cpp
+++ b/src/plugins/mcusupport/mcusupportoptions.cpp
@@ -1305,7 +1305,8 @@ Tasks McuDependenciesKitAspect::validate(const Kit *k) const
         if (!environment.hasKey(dependency.name)) {
             result << BuildSystemTask(Task::Warning, tr("Environment variable %1 not defined.").arg(dependency.name));
         } else {
-            const auto path = Utils::FilePath::fromString(environment.value(dependency.name) + "/" + dependency.value);
+            const auto path = Utils::FilePath::fromUserInput(
+                        environment.value(dependency.name) + "/" + dependency.value);
             if (!path.exists()) {
                 result << BuildSystemTask(Task::Warning, tr("%1 not found.").arg(path.toUserOutput()));
             }
diff --git a/src/plugins/mcusupport/mcusupportversiondetection.cpp b/src/plugins/mcusupport/mcusupportversiondetection.cpp
index 1266202ef84..de94cc01fe2 100644
--- a/src/plugins/mcusupport/mcusupportversiondetection.cpp
+++ b/src/plugins/mcusupport/mcusupportversiondetection.cpp
@@ -62,14 +62,13 @@ QString McuPackageExecutableVersionDetector::parseVersion(const QString &package
     if (m_detectionPath.isEmpty() || m_detectionRegExp.isEmpty())
         return QString();
 
-    QString binaryPath = QDir::toNativeSeparators(packagePath + "/" + m_detectionPath);
-    if (!Utils::FilePath::fromString(binaryPath).exists())
+    const Utils::FilePath binaryPath = Utils::FilePath::fromString(packagePath) / m_detectionPath;
+    if (!binaryPath.exists())
         return QString();
 
-
     const int execTimeout = 3000; // usually runs below 1s, but we want to be on the safe side
     QProcess binaryProcess;
-    binaryProcess.start(binaryPath, m_detectionArgs);
+    binaryProcess.start(binaryPath.toString(), m_detectionArgs);
     if (!binaryProcess.waitForStarted())
         return QString();
     binaryProcess.waitForFinished(execTimeout);