diff --git a/lib/src/d4h.ts b/lib/src/d4h.ts
index cd892b2..3f06afc 100644
--- a/lib/src/d4h.ts
+++ b/lib/src/d4h.ts
@@ -52,7 +52,7 @@ export default class D4H {
             let optionsList = url.searchParams;
 
             if (options.groupId !== undefined) {
-                optionsList.append("group_id", "true");
+                optionsList.append("group_id", options.groupId.toString());
             }
 
             if (options.includeDetails !== undefined) {