diff --git a/modules/reitit-core/src/reitit/coercion.cljc b/modules/reitit-core/src/reitit/coercion.cljc
index 8dd08d83..bc3dc6ca 100644
--- a/modules/reitit-core/src/reitit/coercion.cljc
+++ b/modules/reitit-core/src/reitit/coercion.cljc
@@ -1,5 +1,5 @@
 (ns reitit.coercion
-  (:require [clojure.walk :as walk]
+  (:require [#?(:clj reitit.walk :cljs clojure.walk) :as walk]
             [reitit.impl :as impl])
   #?(:clj
      (:import (java.io Writer))))
diff --git a/modules/reitit-core/src/reitit/walk.clj b/modules/reitit-core/src/reitit/walk.clj
new file mode 100644
index 00000000..b8b832fd
--- /dev/null
+++ b/modules/reitit-core/src/reitit/walk.clj
@@ -0,0 +1,52 @@
+(ns ^:no-doc  reitit.walk)
+
+(defprotocol Walkable
+  (-walk [coll f]))
+
+(extend-protocol Walkable
+  nil
+  (-walk [_ _] nil)
+  Object
+  (-walk [x _] x)
+  clojure.lang.IMapEntry
+  (-walk [e f] (clojure.lang.MapEntry. (f (.key e)) (f (.val e))))
+  clojure.lang.ISeq
+  (-walk [coll f] (map f coll))
+  clojure.lang.PersistentList
+  (-walk [coll f] (apply list (map f coll)))
+  clojure.lang.PersistentList$EmptyList
+  (-walk [x _] x)
+  clojure.lang.IRecord
+  (-walk [r f] (reduce (fn [r x] (conj r (f x))) r r)))
+
+(defn- -walk-default
+  [coll f]
+  (into (empty coll) (map f) coll))
+
+(doseq [type [clojure.lang.PersistentArrayMap
+              clojure.lang.PersistentHashMap
+              clojure.lang.PersistentHashSet
+              clojure.lang.PersistentVector
+              clojure.lang.PersistentQueue
+              clojure.lang.PersistentStructMap
+              clojure.lang.PersistentTreeMap
+              clojure.lang.PersistentTreeSet]]
+  (extend type Walkable {:-walk -walk-default}))
+
+(defn walk
+  [inner outer form]
+  (outer (-walk form inner)))
+
+(defn postwalk [f form] (walk (partial postwalk f) f form))
+
+(defn- keywordize
+  [m]
+  (persistent!
+   (reduce-kv
+    (fn [m k v] (if (string? k) (assoc! m (keyword k) v) m))
+    (transient {})
+    m)))
+
+(defn keywordize-keys
+  [m]
+  (postwalk (fn [x] (if (map? x) (keywordize m) x)) m))