diff --git a/lib/utils.js b/lib/utils.js
index 99468e8..5d660a2 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -370,7 +370,7 @@ function pduReturn(pdu, status, tlvs, callback) {
 	}
 
 	if (err === null && defs.errors[status] === undefined) {
-		err = new Error('larvitsmpp: lib/utils.js: pduReturn() - Invalid status');
+		err = new Error('larvitsmpp: lib/utils.js: pduReturn() - Invalid status: "' + status + '"');
 	}
 
 	if (err === null && defs.cmds[pdu.cmdName + '_resp'] === undefined) {