diff --git a/src/generator.c b/src/generator.c
index f90e4adc..9ba53549 100644
--- a/src/generator.c
+++ b/src/generator.c
@@ -207,6 +207,7 @@ static bool server_alive(ckpool_t *ckp, server_instance_t *si, bool pinging)
 	userpass = strdup(si->auth);
 	realloc_strcat(&userpass, ":");
 	realloc_strcat(&userpass, si->pass);
+	dealloc(cs->auth);
 	cs->auth = http_base64(userpass);
 	dealloc(userpass);
 	if (!cs->auth) {