diff --git a/lib/strings_mosq.c b/lib/strings_mosq.c
index 419294a6..2516b06b 100644
--- a/lib/strings_mosq.c
+++ b/lib/strings_mosq.c
@@ -75,6 +75,10 @@ const char *mosquitto_strerror(int mosq_errno)
 			return "Proxy error.";
 		case MOSQ_ERR_MALFORMED_UTF8:
 			return "Malformed UTF-8";
+		case MOSQ_ERR_KEEPALIVE:
+			return "Keepalive exceeded";
+		case MOSQ_ERR_LOOKUP:
+			return "DNS Lookup failed";
 		case MOSQ_ERR_DUPLICATE_PROPERTY:
 			return "Duplicate property in property list";
 		case MOSQ_ERR_TLS_HANDSHAKE: