diff --git a/src/chatdlg.cpp b/src/chatdlg.cpp
index d49a716fb9..7a5433b6c2 100644
--- a/src/chatdlg.cpp
+++ b/src/chatdlg.cpp
@@ -93,6 +93,11 @@ CChatDlg::CChatDlg ( QWidget* parent ) : CBaseDlg ( parent, Qt::Window ) // use
     // Now tell the layout about the menu
     layout()->setMenuBar ( pMenu );
 
+#if defined( ANDROID ) || defined( Q_OS_IOS )
+    // for the Android and iOS version maximize the window (#3383)
+    setWindowState ( Qt::WindowMaximized );
+#endif
+
     // Connections -------------------------------------------------------------
     QObject::connect ( edtLocalInputText, &QLineEdit::textChanged, this, &CChatDlg::OnLocalInputTextTextChanged );