diff --git a/packages/binding-coap/src/coap-server.ts b/packages/binding-coap/src/coap-server.ts
index 4f11f9500..649299289 100644
--- a/packages/binding-coap/src/coap-server.ts
+++ b/packages/binding-coap/src/coap-server.ts
@@ -660,7 +660,7 @@ export default class CoapServer implements ProtocolServer {
 
         if (observe == null) {
             debug(
-                `CoapServer on port ${this.getPort()} rejects '${affordanceKey}' read from ${Helpers.toUriLiteral(
+                `CoapServer on port ${this.getPort()} rejects '${affordanceKey}' event subscription from ${Helpers.toUriLiteral(
                     req.rsinfo.address
                 )}:${req.rsinfo.port}`
             );