diff --git a/field_types/slider_field/slider_field.php b/field_types/slider_field/slider_field.php
index 9679014..2bdbe56 100644
--- a/field_types/slider_field/slider_field.php
+++ b/field_types/slider_field/slider_field.php
@@ -84,7 +84,7 @@ public function display_field( $field, $group_index = 1, $field_index = 1 ) {
 
     $output = '';
     $output .= sprintf(
-      '<div id="slider_%s" class="mf_slider_field" data="{min:\'%s\', max:\'%s\', value:\'%s\', stepping:\'%d\'}"></div>',
+      '<div id="slider_%s" class="mf_slider_field" data="{min:\'%s\', max:\'%s\', value:\'%s\', stepping:\'%s\'}"></div>',
       $field['input_id'], 
       $field['options']['value_min'], 
       $field['options']['value_max'],