diff --git a/notebook/static/base/js/utils.js b/notebook/static/base/js/utils.js
index a1074e6b4..588e6edd0 100644
--- a/notebook/static/base/js/utils.js
+++ b/notebook/static/base/js/utils.js
@@ -1041,26 +1041,20 @@ define([
 
     var format_filesize = function(filesize) {
       if (filesize) {
-        return (convertFileSize(filesize));
-      }
-    }
-    
-    var convertFileSize = function(filesize){
-      var units = ['B', 'kB', 'MB', 'GB', 'TB'];
-      var base = 1000;
-      if (Math.abs(filesize) < base){
-        return filesize + " B";
+        var units = ['B', 'kB', 'MB', 'GB', 'TB'];
+        var base = 1000;
+        if (Math.abs(filesize) < base){
+          return filesize + " B";
+        }
+        var u = -1;
+        do {
+          filesize /= base;
+          u++;
+        } while(Math.abs(filesize) >= base && u < units.length - 1);
+        return filesize.toFixed(1) + " " + units[u];
       }
-      var u = -1;
-      do{
-        filesize /= base;
-        u++;
-      } while(Math.abs(filesize) >= base && u < units.length - 1);
-      return filesize.toFixed(1) + " " + units[u];
-    
     }
 
-
     // javascript stores text as utf16 and string indices use "code units",
     // which stores high-codepoint characters as "surrogate pairs",
     // which occupy two indices in the javascript string.