diff --git a/lib/datastore.js b/lib/datastore.js
index 4b978ad3..8c50a073 100755
--- a/lib/datastore.js
+++ b/lib/datastore.js
@@ -619,7 +619,10 @@ Datastore.prototype._update = function (query, updateQuery, options, cb) {
             modifiedDoc = model.modify(candidates[i], updateQuery);
             if (self.timestampData) {
               modifiedDoc.createdAt = createdAt;
-              modifiedDoc.updatedAt = new Date();
+              // If no updatedAt date is present, using the current time
+              if (updateQuery.$set.updatedAt === undefined) {
+                modifiedDoc.updatedAt = new Date();
+              }
             }
             modifications.push({ oldDoc: candidates[i], newDoc: modifiedDoc });
           }