diff --git a/issuer.c b/issuer.c
index 9d635cf..544d2d0 100644
--- a/issuer.c
+++ b/issuer.c
@@ -50,6 +50,7 @@ int process_issuer(char *buffer) {
     if (0 == strncasecmp("OK", buffer, 2)) {
         switch (issuer.state) {
             case JOINPROCEED:
+                bzero(buffer, MAX_BUFSIZE);
                 issuer.state = READY;
                 break;
             default: