diff --git a/src/js/script.js b/src/js/script.js
index 8974f0881..08c7ab1a5 100644
--- a/src/js/script.js
+++ b/src/js/script.js
@@ -331,6 +331,11 @@ async function activateFunbox(funbox, mode) {
       settingsGroups.keymapMode.updateButton();
       restartTest();
     }
+
+    if (funbox === "read_ahead") {
+      setHighlightMode("letter", true);
+      restartTest();
+    }
   } else if (mode === "script") {
     if (funbox === "tts") {
       $("#funBoxTheme").attr("href", `funbox/simon_says.css`);
diff --git a/src/js/userconfig.js b/src/js/userconfig.js
index fc0d64499..b931498cd 100644
--- a/src/js/userconfig.js
+++ b/src/js/userconfig.js
@@ -810,8 +810,11 @@ function toggleShowLiveAcc() {
 }
 
 function setHighlightMode(mode, nosave) {
-  if (activeFunBox === "nospace" && mode === "word") {
-    Misc.showNotification("Can't use word highlight with nospace funbox", 3000);
+  if (
+    mode === "word" &&
+    (activeFunBox === "nospace" || activeFunBox === "read_ahead")
+  ) {
+    Misc.showNotification("Can't use word highlight with this funbox", 3000);
     return;
   }
   if (mode == null || mode == undefined) {