diff --git a/app/models/completion_prompt.rb b/app/models/completion_prompt.rb
index 0bcde5ff..9167ffef 100644
--- a/app/models/completion_prompt.rb
+++ b/app/models/completion_prompt.rb
@@ -23,7 +23,7 @@ class CompletionPrompt < ActiveRecord::Base
   def messages_with_input(input)
     return unless input
 
-    messages_hash.merge(input: "<input>#{input}</input")
+    messages_hash.merge(input: "<input>#{input}</input>")
   end
 
   private