diff --git a/src/features/Fast.js b/src/features/Fast.js
index b3c75f3..034a9ee 100644
--- a/src/features/Fast.js
+++ b/src/features/Fast.js
@@ -30,7 +30,7 @@
    * @default 40
    * @static
    */
-  tracking.Fast.FAST_THRESHOLD = 40;
+  tracking.Fast.THRESHOLD = 40;
 
   /**
    * Caches coordinates values of the circle surounding the pixel candidate p.
@@ -57,7 +57,7 @@
     var corners = [];
 
     if (opt_threshold === undefined) {
-      opt_threshold = this.FAST_THRESHOLD;
+      opt_threshold = this.THRESHOLD;
     }
 
     // When looping through the image pixels, skips the first three lines from