diff --git a/lib/vtt.js b/lib/vtt.js
index 66ab23f..7056728 100644
--- a/lib/vtt.js
+++ b/lib/vtt.js
@@ -425,7 +425,7 @@
         }
         // Set the class list (as a list of classes, separated by space).
         if (m[2]) {
-          node.className = m[2].substr(1).replace('.', ' ');
+          node.className = m[2].substr(1).replace(/\./g, ' ');
         }
         // Append the node to the current node, and enter the scope of the new
         // node.