diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesystemengine_unix.cpp
index 3baf2d20b78..ea903fa9909 100644
--- a/src/corelib/io/qfilesystemengine_unix.cpp
+++ b/src/corelib/io/qfilesystemengine_unix.cpp
@@ -1374,10 +1374,7 @@ bool QFileSystemEngine::moveFileToTrash(const QFileSystemEntry &source,
     int counter = 0;
     QFile infoFile;
     auto makeUniqueTrashedName = [trashedName, &counter]() -> QString {
-        ++counter;
-        return QString(QLatin1String("/%1-%2"))
-                                        .arg(trashedName)
-                                        .arg(counter, 4, 10, QLatin1Char('0'));
+        return QString::asprintf("/%ls-%04d", qUtf16Printable(trashedName), ++counter);
     };
     do {
         while (QFile::exists(trashDir.filePath(filesDir) + uniqueTrashedName))