diff --git a/lib/krb5/pkinit.c b/lib/krb5/pkinit.c
index e41e03ad9..233c2eb27 100644
--- a/lib/krb5/pkinit.c
+++ b/lib/krb5/pkinit.c
@@ -1688,6 +1688,7 @@ pk_rd_pa_reply_dh(krb5_context context,
 	    ret = KRB5KRB_ERR_GENERIC;
 	    goto out;
 	}
+	c_n = NULL;
     }