diff --git a/inject.js b/inject.js
index ff7ac90e..99dab39b 100644
--- a/inject.js
+++ b/inject.js
@@ -351,7 +351,9 @@ function defineVideoController() {
     fragment.appendChild(wrapper);
 
     switch (true) {
-      case location.hostname == "www.amazon.com":
+      // Only special-case Prime Video, not product-page videos (which use
+      // "vjs-tech"), otherwise the overlay disappears in fullscreen mode
+      case location.hostname == "www.amazon.com" && !this.video.classList.contains("vjs-tech"):
       case location.hostname == "www.reddit.com":
       case /hbogo\./.test(location.hostname):
         // insert before parent to bypass overlay