diff --git a/pam_yubico.c b/pam_yubico.c
index 362c2c1..802a5a1 100644
--- a/pam_yubico.c
+++ b/pam_yubico.c
@@ -448,11 +448,9 @@ do_challenge_response(pam_handle_t *pamh, struct cfg *cfg, const char *username)
 
   unsigned int flags = 0;
   unsigned int response_len = 0;
-  unsigned int expect_bytes = 0;
   YK_KEY *yk = NULL;
   CR_STATE state;
 
-  int len;
   char *errstr = NULL;
 
   struct passwd *p;