diff --git a/lib/document.js b/lib/document.js
index 7aea1630586..d528ed40c91 100644
--- a/lib/document.js
+++ b/lib/document.js
@@ -975,6 +975,18 @@ Document.prototype.validate = function (cb) {
   var validating = {}
     , total = 0;
 
+  // gh-661: if a whole array is modified, make sure to run validation on all
+  // the children as well
+  for (var i = 0; i < paths.length; ++i) {
+    var path = paths[i];
+    var val = self.getValue(path);
+    if (val instanceof Array && !Buffer.isBuffer(val)) {
+      var numElements = val.length;
+      for (var j = 0; j < numElements; ++j) {
+        paths.push(path + '.' + j);
+      }
+    }
+  }
   paths.forEach(validatePath);
   return promise;
 
diff --git a/test/schema.validation.test.js b/test/schema.validation.test.js
index d8c126de395..b894017f598 100644
--- a/test/schema.validation.test.js
+++ b/test/schema.validation.test.js
@@ -694,5 +694,32 @@ describe('schema', function(){
         });
       });
     });
+
+    it('should allow an array of enums (gh-661)', function(done) {
+      var validBreakfastFoods = ['bacon', 'eggs', 'steak', 'coffee', 'butter'];
+      var breakfastSchema = new Schema({
+        foods: [{ type: String, enum: validBreakfastFoods }]
+      });
+      var Breakfast = mongoose.model('gh-661', breakfastSchema, 'gh-661');
+
+      var goodBreakfast = new Breakfast({ foods: ['eggs', 'bacon'] });
+      goodBreakfast.validate(function(error) {
+        assert.ifError(error);
+
+        var badBreakfast = new Breakfast({ foods: ['tofu', 'waffles', 'coffee'] });
+        badBreakfast.validate(function(error) {
+          assert.ok(error);
+          assert.ok(error.errors['foods.0']);
+          assert.equal(error.errors['foods.0'].message,
+            '`tofu` is not a valid enum value for path `foods`.');
+          assert.ok(error.errors['foods.1']);
+          assert.equal(error.errors['foods.1'].message,
+            '`waffles` is not a valid enum value for path `foods`.');
+          assert.ok(!error.errors['foods.2']);
+
+          done();
+        });
+      });
+    });
   });
 });