diff --git a/google.visualization/google.visualization.d.ts b/google.visualization/google.visualization.d.ts
index e66054b479..a4dc1b7b1a 100644
--- a/google.visualization/google.visualization.d.ts
+++ b/google.visualization/google.visualization.d.ts
@@ -147,6 +147,7 @@ declare namespace google {
             id?: string;
             role?: string;
             pattern?: string;
+            p?: any;
         }
 
         export interface DataObject {