diff --git a/custom-filtering.html b/custom-filtering.html
index 8b2573d2..0cbf6a90 100644
--- a/custom-filtering.html
+++ b/custom-filtering.html
@@ -663,7 +663,7 @@ var tfConfig = {
     },
     loader: true,
     col_types: [
-        'none',
+        'string',
         'string',
         'number',
         'string',
@@ -672,7 +672,7 @@ var tfConfig = {
         'string',
         { type: 'date', locale: 'en-GB' },
         'date',
-        'none'
+        'string'
     ],
 
     /* custom filtering with cell_parser delegate */