diff --git a/launcher/Untar.cpp b/launcher/Untar.cpp
index bae6c5d17..1d11dfd60 100644
--- a/launcher/Untar.cpp
+++ b/launcher/Untar.cpp
@@ -94,7 +94,7 @@ union Buffer {
     struct Header header;
 };
 
-bool readLonglink(QIODevice* in, Buffer buffer, QByteArray& longlink)
+bool readLonglink(QIODevice* in, Buffer& buffer, QByteArray& longlink)
 {
     qint64 n = 0;
     qint64 size = strtoll(buffer.header.size, NULL, 8);