diff --git a/lms/static/coffee/src/discussion/views/new_post_view.coffee b/lms/static/coffee/src/discussion/views/new_post_view.coffee
index 8969d25748..86dbffa5b8 100644
--- a/lms/static/coffee/src/discussion/views/new_post_view.coffee
+++ b/lms/static/coffee/src/discussion/views/new_post_view.coffee
@@ -147,6 +147,7 @@ if Backbone?
                   @$(".new-post-body textarea").val("").attr("prev-text", "")
                   @$(".new-post-tags").val("")
                   @$(".new-post-tags").importTags("")
+                  @$(".wmd-preview p").html("")
                   @collection.add thread
 
       setActiveItem: (event) ->