diff --git a/src/createPersistoid.js b/src/createPersistoid.js
index c4423af60..701170326 100644
--- a/src/createPersistoid.js
+++ b/src/createPersistoid.js
@@ -16,7 +16,10 @@ export default function createPersistoid(config: PersistConfig): Persistoid {
     config.keyPrefix !== undefined ? config.keyPrefix : KEY_PREFIX
   }${config.key}`
   const storage = config.storage
-  const serialize = config.serialize === false ? x => x : defaultSerialize
+  let serialize = config.serialize === false ? x => x : defaultSerialize
+  if (typeof config.serialize === 'function') {
+    serialize = config.serialize
+  }
   const writeFailHandler = config.writeFailHandler || null
 
   // initialize stateful values
diff --git a/src/getStoredState.js b/src/getStoredState.js
index bcf78553c..d30981e8a 100644
--- a/src/getStoredState.js
+++ b/src/getStoredState.js
@@ -13,7 +13,10 @@ export default function getStoredState(
   }${config.key}`
   const storage = config.storage
   const debug = config.debug
-  const deserialize = config.serialize === false ? x => x : defaultDeserialize
+  let deserialize = config.serialize === false ? x => x : defaultDeserialize
+  if (typeof config.deserialize === 'function') {
+    deserialize = config.deserialize
+  }
   return storage.getItem(storageKey).then(serialized => {
     if (!serialized) return undefined
     else {
diff --git a/src/types.js b/src/types.js
index 13549104b..a0a76120b 100644
--- a/src/types.js
+++ b/src/types.js
@@ -23,7 +23,8 @@ export type PersistConfig = {
   stateReconciler?: false | Function,
   getStoredState?: PersistConfig => Promise<PersistedState>, // used for migrations
   debug?: boolean,
-  serialize?: boolean,
+  serialize?: boolean | Function,
+  deserialize?: Function | null,
   timeout?: number,
   writeFailHandler?: Function,
 }