diff --git a/web/presentation_mode.js b/web/presentation_mode.js
index 0c3253b34..f94ef7b08 100644
--- a/web/presentation_mode.js
+++ b/web/presentation_mode.js
@@ -104,8 +104,8 @@ var PresentationMode = {
       this.container.requestFullscreen();
     } else if (this.container.mozRequestFullScreen) {
       this.container.mozRequestFullScreen();
-    } else if (this.container.webkitRequestFullScreen) {
-      this.container.webkitRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT);
+    } else if (this.container.webkitRequestFullscreen) {
+      this.container.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
     } else if (this.container.msRequestFullscreen) {
       this.container.msRequestFullscreen();
     } else {