diff --git a/lib/server.js b/lib/server.js
index 1509be6..5871d7a 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -480,7 +480,6 @@ WalletService.prototype.savePreferences = function(opts, cb) {
   }];
 
   opts = _.pick(opts, _.pluck(preferences, 'name'));
-
   try {
     _.each(preferences, function(preference) {
       var value = opts[preference.name];
@@ -495,15 +494,17 @@ WalletService.prototype.savePreferences = function(opts, cb) {
   }
 
   self._runLocked(cb, function(cb) {
-    var preferences = Model.Preferences.create({
-      walletId: self.walletId,
-      copayerId: self.copayerId,
-      email: opts.email,
-      language: opts.language,
-      unit: opts.unit,
-    });
-    self.storage.storePreferences(preferences, function(err) {
-      return cb(err);
+    self.storage.fetchPreferences(self.walletId, self.copayerId, function(err, oldPref) {
+      if (err) return cb(err);
+
+      var newPref = Model.Preferences.create({
+        walletId: self.walletId,
+        copayerId: self.copayerId,
+      });
+      var preferences = Model.Preferences.fromObj(_.defaults(newPref, opts, oldPref));
+      self.storage.storePreferences(preferences, function(err) {
+        return cb(err);
+      });
     });
   });
 };
diff --git a/test/integration/server.js b/test/integration/server.js
index 5d6590d..98cc5c3 100644
--- a/test/integration/server.js
+++ b/test/integration/server.js
@@ -260,7 +260,7 @@ helpers.createAddresses = function(server, wallet, main, change, cb) {
 
 var storage, blockchainExplorer;
 
-var useMongo = true;
+var useMongo = false;
 
 function initStorage(cb) {
   function getDb(cb) {
@@ -1186,7 +1186,7 @@ describe('Wallet service', function() {
         });
       });
     });
-    it.only('should save preferences incrementally', function(done) {
+    it('should save preferences incrementally', function(done) {
       async.series([
 
         function(next) {