diff --git a/lib/agent.js b/lib/agent.js
index 3074bb3..121e57b 100644
--- a/lib/agent.js
+++ b/lib/agent.js
@@ -133,7 +133,7 @@ Agent.prototype._varbind_set_single =
 		    value: data.noSuchInstance });
 	} else if (typeof (vb) === 'number') {
 		if (req.pdu.op != PDU.SetRequest && vb != PDU.genErr) {
-			this.log.warn({ snmpmsg: req },
+			this._log.warn({ snmpmsg: req },
 			    'provider attempted to set prohibited ' +
 			    'error code ' + vb + ' for varbind ' + idx);
 			vb = PDU.genErr;