diff --git a/src/taoensso/timbre/appenders/carmine.clj b/src/taoensso/timbre/appenders/carmine.clj
index 843e5e4..06f55cc 100644
--- a/src/taoensso/timbre/appenders/carmine.clj
+++ b/src/taoensso/timbre/appenders/carmine.clj
@@ -71,7 +71,7 @@
 
        (when (> nmax-entries 0)
          (car/wcar conn-opts
-           (binding [nippy/*freeze-fallback* :write-unfreezable]
+           (binding [nippy/*final-freeze-fallback* nippy/freeze-fallback-as-str]
              (car/hset k-hash entry-hash entry))
            (car/zadd k-zset udt entry-hash)