diff --git a/src/plugin.js b/src/plugin.js
index c50a1b0..588b464 100644
--- a/src/plugin.js
+++ b/src/plugin.js
@@ -327,7 +327,7 @@ class vttThumbnailsPlugin {
     return parseInt((timestampParts.hours * (60 * 60)) +
       (timestampParts.minutes * 60) +
       timestampParts.seconds +
-      (timestampParts.milliseconds * 1000))
+      (timestampParts.milliseconds / 1000))
   }
 
   trim (str, charlist) {