diff --git a/src/QtumRPC.ts b/src/QtumRPC.ts
index 7e23f5c..46d4c84 100644
--- a/src/QtumRPC.ts
+++ b/src/QtumRPC.ts
@@ -335,6 +335,7 @@ export class QtumRPC extends QtumRPCRaw {
     }
 
     if (req.waitconf) {
+      args.push(false);
       args.push(req.waitconf)
     }