diff --git a/lib/fog/aws/requests/compute/describe_instances.rb b/lib/fog/aws/requests/compute/describe_instances.rb
index a63d87af7..9f809c619 100644
--- a/lib/fog/aws/requests/compute/describe_instances.rb
+++ b/lib/fog/aws/requests/compute/describe_instances.rb
@@ -207,6 +207,7 @@ module Fog
 
               reservation_set[instance['reservationId']] ||= {
                 'groupSet'      => instance['groupSet'],
+                'groupIds'      => instance['groupIds'],
                 'instancesSet'  => [],
                 'ownerId'       => instance['ownerId'],
                 'reservationId' => instance['reservationId']
diff --git a/lib/fog/aws/requests/compute/run_instances.rb b/lib/fog/aws/requests/compute/run_instances.rb
index a35b66eae..11959586e 100644
--- a/lib/fog/aws/requests/compute/run_instances.rb
+++ b/lib/fog/aws/requests/compute/run_instances.rb
@@ -160,6 +160,7 @@ module Fog
             }
             instances_set << instance
             self.data[:instances][instance_id] = instance.merge({
+              'groupIds'            => [],
               'groupSet'            => group_set,
               'iamInstanceProfile'  => {},
               'networkInterfaces'   => [],