diff --git a/test/testfolderman.cpp b/test/testfolderman.cpp
index 9689a8592d7ec..8c348945e9c3a 100644
--- a/test/testfolderman.cpp
+++ b/test/testfolderman.cpp
@@ -32,6 +32,9 @@ class TestFolderMan: public QObject
 private slots:
     void testLeaveShare()
     {
+        QTemporaryDir dir;
+        ConfigFile::setConfDir(dir.path()); // we don't want to pollute the user's config file
+
         constexpr auto firstSharePath = "A/sharedwithme_A.txt";
         constexpr auto secondSharePath = "A/B/sharedwithme_B.data";
 
@@ -95,7 +98,7 @@ private slots:
            reply = new FakePayloadReply(op, req, {}, nullptr);
 
            emit incomingShareDeleted();
-           
+
            return reply;
         });