diff --git a/retroshare-gui/src/gui/im_history/ImHistoryBrowser.cpp b/retroshare-gui/src/gui/im_history/ImHistoryBrowser.cpp
index 9f84f6856..1f3f58260 100644
--- a/retroshare-gui/src/gui/im_history/ImHistoryBrowser.cpp
+++ b/retroshare-gui/src/gui/im_history/ImHistoryBrowser.cpp
@@ -92,7 +92,7 @@ void ImHistoryBrowserCreateItemsThread::run()
 
 /** Default constructor */
 ImHistoryBrowser::ImHistoryBrowser(const ChatId &chatId, QTextEdit *edit,const QString &chatTitle, QWidget *parent)
-  : QDialog(parent, Qt::WindowSystemMenuHint | Qt::WindowTitleHint | Qt::WindowCloseButtonHint)
+  : QDialog(parent, Qt::WindowSystemMenuHint | Qt::WindowTitleHint | Qt::WindowMinMaxButtonsHint | Qt::WindowCloseButtonHint)
 {
     /* Invoke Qt Designer generated QObject setup routine */
     ui.setupUi(this);