diff --git a/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp b/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp
index c98734406..5fd114d0f 100644
--- a/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp
+++ b/code/ryzom/tools/client/ryzom_installer/src/mainwindow.cpp
@@ -31,6 +31,8 @@ CMainWindow::CMainWindow():QMainWindow(), m_statusLabel(NULL)
 {
 	setupUi(this);
 
+	setWindowFlags(windowFlags() & ~Qt::WindowMaximizeButtonHint);
+
 	// downloader
 	m_downloader = new CDownloader(this);