diff --git a/src/taoensso/nippy.clj b/src/taoensso/nippy.clj
index a14e473..65d0701 100644
--- a/src/taoensso/nippy.clj
+++ b/src/taoensso/nippy.clj
@@ -255,48 +255,50 @@
 
 (def stress-data
   "Reference data used for tests & benchmarks."
-  {;; Breaks reader, roundtrip equality
-   :bytes        (byte-array [(byte 1) (byte 2) (byte 3)])
+  (let [support-tagged-literals?
+        (utils/version-sufficient? (clojure-version) "1.4.0")]
 
-   :nil          nil
-   :boolean      true
+    {;; Breaks reader, roundtrip equality
+     :bytes        (byte-array [(byte 1) (byte 2) (byte 3)])
 
-   :char-utf8    \ಬ
-   :string-utf8  "ಬಾ ಇಲ್ಲಿ ಸಂಭವಿಸ"
-   :string-long  (apply str (range 1000))
-   :keyword      :keyword
-   :keyword-ns   ::keyword
+     :nil          nil
+     :boolean      true
 
-   :list         (list 1 2 3 4 5 (list 6 7 8 (list 9 10)))
-   :list-quoted  '(1 2 3 4 5 (6 7 8 (9 10)))
-   :list-empty   (list)
-   :vector       [1 2 3 4 5 [6 7 8 [9 10]]]
-   :vector-empty []
-   :map          {:a 1 :b 2 :c 3 :d {:e 4 :f {:g 5 :h 6 :i 7}}}
-   :map-empty    {}
-   :set          #{1 2 3 4 5 #{6 7 8 #{9 10}}}
-   :set-empty    #{}
-   :meta         (with-meta {:a :A} {:metakey :metaval})
+     :char-utf8    \ಬ
+     :string-utf8  "ಬಾ ಇಲ್ಲಿ ಸಂಭವಿಸ"
+     :string-long  (apply str (range 1000))
+     :keyword      :keyword
+     :keyword-ns   ::keyword
 
-   ;; Breaks reader
-   :queue        (-> (PersistentQueue/EMPTY) (conj :a :b :c :d :e :f :g))
-   :queue-empty  (PersistentQueue/EMPTY)
+     :list         (list 1 2 3 4 5 (list 6 7 8 (list 9 10)))
+     :list-quoted  '(1 2 3 4 5 (6 7 8 (9 10)))
+     :list-empty   (list)
+     :vector       [1 2 3 4 5 [6 7 8 [9 10]]]
+     :vector-empty []
+     :map          {:a 1 :b 2 :c 3 :d {:e 4 :f {:g 5 :h 6 :i 7}}}
+     :map-empty    {}
+     :set          #{1 2 3 4 5 #{6 7 8 #{9 10}}}
+     :set-empty    #{}
+     :meta         (with-meta {:a :A} {:metakey :metaval})
 
-   :coll         (repeatedly 1000 rand)
+     ;; Breaks reader
+     :queue        (-> (PersistentQueue/EMPTY) (conj :a :b :c :d :e :f :g))
+     :queue-empty  (PersistentQueue/EMPTY)
 
-   :byte         (byte 16)
-   :short        (short 42)
-   :integer      (int 3)
-   :long         (long 3)
-   :bigint       (bigint 31415926535897932384626433832795)
+     :coll         (repeatedly 1000 rand)
 
-   :float        (float 3.14)
-   :double       (double 3.14)
-   :bigdec       (bigdec 3.1415926535897932384626433832795)
+     :byte         (byte 16)
+     :short        (short 42)
+     :integer      (int 3)
+     :long         (long 3)
+     :bigint       (bigint 31415926535897932384626433832795)
 
-   :ratio        22/7
+     :float        (float 3.14)
+     :double       (double 3.14)
+     :bigdec       (bigdec 3.1415926535897932384626433832795)
 
-   ;; Clojure 1.4+
-   ;; :tagged-uuid  (java.util.UUID/randomUUID)
-   ;; :tagged-date  (java.util.Date.)
-   })
\ No newline at end of file
+     :ratio        22/7
+
+     ;; Clojure 1.4+
+     :tagged-uuid  (when support-tagged-literals? (java.util.UUID/randomUUID))
+     :tagged-date  (when support-tagged-literals? (java.util.Date.))}))
\ No newline at end of file
diff --git a/src/taoensso/nippy/utils.clj b/src/taoensso/nippy/utils.clj
index fce02b6..b70941e 100644
--- a/src/taoensso/nippy/utils.clj
+++ b/src/taoensso/nippy/utils.clj
@@ -1,5 +1,6 @@
 (ns taoensso.nippy.utils
-  {:author "Peter Taoussanis"})
+  {:author "Peter Taoussanis"}
+  (:require [clojure.string :as str]))
 
 (defmacro case-eval
   "Like `case` but evaluates test constants for their compile-time value."
@@ -35,4 +36,15 @@
                         (map deref)
                         dorun))))]
           (if ~as-ms? (Math/round (/ nanosecs# 1000000.0)) nanosecs#))
-        (catch Exception e# (str "DNF: " (.getMessage e#)))))
\ No newline at end of file
+        (catch Exception e# (str "DNF: " (.getMessage e#)))))
+
+(defn version-compare
+  "Comparator for version strings like x.y.z, etc."
+  [x y]
+  (let [vals (fn [s] (vec (map #(Integer/parseInt %) (str/split s #"\."))))]
+    (compare (vals x) (vals y))))
+
+(defn version-sufficient?
+  [version-str min-version-str]
+  (try (>= (version-compare version-str min-version-str) 0)
+       (catch Exception _ false)))
\ No newline at end of file