--- a/QTfrontend/game.cpp	Wed May 16 10:11:00 2018 +0200
+++ b/QTfrontend/game.cpp	Wed May 16 18:09:13 2018 +0200
@@ -427,6 +427,8 @@
         arguments << "--no-healthtag";
     if (config->Form->ui.pageOptions->CBTagOpacity->isChecked())
         arguments << "--translucent-tags";
+    arguments << "--chat-size";
+    arguments << QString::number(config->chatSize());
 
     return arguments;
 }