diff --git a/docs/changelog.rst b/docs/changelog.rst
index 48e8b9aa..b9ad5b0e 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -25,6 +25,7 @@ Changes in 0.9.X - DEV
 - Updated URL and Email Field regex validators, added schemes argument to URLField validation. #652
 - Removed get_or_create() deprecated since 0.8.0. #300
 - Capped collection multiple of 256. #1011
+- Added `BaseQuerySet.aggregate_sum` and `BaseQuerySet.aggregate_average` methods.
 
 Changes in 0.9.0
 ================
diff --git a/mongoengine/queryset/base.py b/mongoengine/queryset/base.py
index b949e121..c3abd46a 100644
--- a/mongoengine/queryset/base.py
+++ b/mongoengine/queryset/base.py
@@ -1263,11 +1263,10 @@ class BaseQuerySet(object):
         ])
         if IS_PYMONGO_3:
             result = list(result)
-            if result:
-                return result[0]['total']
         else:
-            if result['result']:
-                return result['result'][0]['total']
+            result = result.get('result')
+        if result:
+            return result[0]['total']
         return 0
 
     def average(self, field):
@@ -1340,11 +1339,10 @@ class BaseQuerySet(object):
         ])
         if IS_PYMONGO_3:
             result = list(result)
-            if result:
-                return result[0]['total']
         else:
-            if result['result']:
-                return result['result'][0]['total']
+            result = result.get('result')
+        if result:
+            return result[0]['total']
         return 0
 
     def item_frequencies(self, field, normalize=False, map_reduce=True):