diff --git a/openedx/core/lib/xblock_builtin/xblock_discussion/xblock_discussion/__init__.py b/openedx/core/lib/xblock_builtin/xblock_discussion/xblock_discussion/__init__.py
index a0a1a0f885..b4fe75bbcd 100644
--- a/openedx/core/lib/xblock_builtin/xblock_discussion/xblock_discussion/__init__.py
+++ b/openedx/core/lib/xblock_builtin/xblock_discussion/xblock_discussion/__init__.py
@@ -8,6 +8,7 @@ import urllib
 from django.contrib.staticfiles.storage import staticfiles_storage
 from django.core.urlresolvers import reverse
 from django.utils.translation import get_language_bidi
+from xblock.completable import XBlockCompletionMode
 from xblock.core import XBlock
 from xblock.fields import Scope, String, UNIQUE_ID
 from web_fragments.fragment import Fragment
@@ -19,6 +20,7 @@ from openedx.core.lib.xblock_builtin import get_css_dependencies, get_js_depende
 from xmodule.raw_module import RawDescriptor
 from xmodule.xml_module import XmlParserMixin
 
+
 log = logging.getLogger(__name__)
 loader = ResourceLoader(__name__)  # pylint: disable=invalid-name
 
@@ -36,6 +38,8 @@ class DiscussionXBlock(XBlock, StudioEditableXBlockMixin, XmlParserMixin):
     """
     Provides a discussion forum that is inline with other content in the courseware.
     """
+    completion_mode = XBlockCompletionMode.EXCLUDED
+
     discussion_id = String(scope=Scope.settings, default=UNIQUE_ID)
     display_name = String(
         display_name=_("Display Name"),
diff --git a/openedx/tests/completion_integration/test_handlers.py b/openedx/tests/completion_integration/test_handlers.py
index 6f426016bb..cca3f95641 100644
--- a/openedx/tests/completion_integration/test_handlers.py
+++ b/openedx/tests/completion_integration/test_handlers.py
@@ -108,6 +108,16 @@ class ScorableCompletionHandlerTestCase(CompletionSetUpMixin, TestCase):
         )
         self.assertFalse(completion.exists())
 
+    def test_handler_skips_discussion_block(self):
+        discussion_block_key = self.course_key.make_usage_key(block_type='discussion', block_id='blue')
+        self.call_scorable_block_completion_handler(discussion_block_key)
+        completion = BlockCompletion.objects.filter(
+            user=self.user,
+            course_key=self.course_key,
+            block_key=discussion_block_key,
+        )
+        self.assertFalse(completion.exists())
+
     def test_signal_calls_handler(self):
         with patch('completion.handlers.scorable_block_completion') as mock_handler:
             PROBLEM_WEIGHTED_SCORE_CHANGED.send_robust(