diff --git a/modules/charts_c3/charts_c3.module b/modules/charts_c3/charts_c3.module
index 9f3ce57fd39388f9d394728af7fbb4534ff29fcc..7efc0205953351b5ee09b2ec9f702ea58bb8b5da 100644
--- a/modules/charts_c3/charts_c3.module
+++ b/modules/charts_c3/charts_c3.module
@@ -62,6 +62,8 @@ function charts_c3_render_charts($options, $categories = array(), $seriesData =
       $chartData->setColumns($c3Data);
     }
     else {
+      array_unshift($categories, 'x');
+      array_push($c3Data, $categories);
       $chartData->setColumns($c3Data);
     }
   }