diff --git a/common/test/acceptance/tests/test_discussion.py b/common/test/acceptance/tests/test_discussion.py
index 512087f0c8..ff37d417f3 100644
--- a/common/test/acceptance/tests/test_discussion.py
+++ b/common/test/acceptance/tests/test_discussion.py
@@ -3,6 +3,7 @@ Tests for discussion pages
 """
 
 from uuid import uuid4
+from nose.plugins.attrib import attr
 
 from .helpers import UniqueCourseTest
 from ..pages.lms.auto_auth import AutoAuthPage
@@ -122,6 +123,7 @@ class DiscussionResponsePaginationTestMixin(object):
         self.assertFalse(self.thread_page.has_add_response_button())
 
 
+@attr('shard_1')
 class DiscussionTabSingleThreadTest(UniqueCourseTest, DiscussionResponsePaginationTestMixin):
     """
     Tests for the discussion page displaying a single thread
@@ -141,6 +143,7 @@ class DiscussionTabSingleThreadTest(UniqueCourseTest, DiscussionResponsePaginati
         self.thread_page.visit()
 
 
+@attr('shard_1')
 class DiscussionCommentDeletionTest(UniqueCourseTest):
     """
     Tests for deleting comments displayed beneath responses in the single thread view.
@@ -184,6 +187,7 @@ class DiscussionCommentDeletionTest(UniqueCourseTest):
         page.delete_comment("comment_other_author")
 
 
+@attr('shard_1')
 class DiscussionCommentEditTest(UniqueCourseTest):
     """
     Tests for editing comments displayed beneath responses in the single thread view.
@@ -273,6 +277,7 @@ class DiscussionCommentEditTest(UniqueCourseTest):
         self.assertTrue(page.is_add_comment_visible("response1"))
 
 
+@attr('shard_1')
 class InlineDiscussionTest(UniqueCourseTest, DiscussionResponsePaginationTestMixin):
     """
     Tests for inline discussions
@@ -330,6 +335,7 @@ class InlineDiscussionTest(UniqueCourseTest, DiscussionResponsePaginationTestMix
         self.check_anonymous_to_peers(False)
 
 
+@attr('shard_1')
 class DiscussionUserProfileTest(UniqueCourseTest):
     """
     Tests for user profile page in discussion tab.
@@ -432,6 +438,8 @@ class DiscussionUserProfileTest(UniqueCourseTest):
     def test_151_threads(self):
         self.check_pages(151)
 
+
+@attr('shard_1')
 class DiscussionSearchAlertTest(UniqueCourseTest):
     """
     Tests for spawning and dismissing alerts related to user search actions and their results.
@@ -505,6 +513,7 @@ class DiscussionSearchAlertTest(UniqueCourseTest):
         ).wait_for_page()
 
 
+@attr('shard_1')
 class DiscussionSortPreferenceTest(UniqueCourseTest):
     """
     Tests for the discussion page displaying a single thread.