diff --git a/src/corelib/io/qfsfileengine_unix.cpp b/src/corelib/io/qfsfileengine_unix.cpp
index 4617d098742..9f081e92959 100644
--- a/src/corelib/io/qfsfileengine_unix.cpp
+++ b/src/corelib/io/qfsfileengine_unix.cpp
@@ -725,7 +725,6 @@ uchar *QFSFileEnginePrivate::map(qint64 offset, qint64 size, QFile::MemoryMapFla
 #endif
 
     Q_Q(QFSFileEngine);
-    Q_UNUSED(flags);
     if (openMode == QIODevice::NotOpen) {
         q->setError(QFile::PermissionsError, qt_error_string(int(EACCES)));
         return 0;