diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6baa3d5ae..cdb21b4ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+* [Add `Twitter::Error::AlreadyPosted`](…)
+
 4.8.1
 -----
 * [Ignore case of profile image extension](https://github.com/sferik/twitter/commit/73760610e959ae868de23de3da661d237fbcb106)
diff --git a/lib/twitter/error/already_posted.rb b/lib/twitter/error/already_posted.rb
new file mode 100644
index 000000000..9a0cac31b
--- /dev/null
+++ b/lib/twitter/error/already_posted.rb
@@ -0,0 +1,10 @@
+require 'twitter/error/forbidden'
+
+module Twitter
+  class Error
+    # Raised when a Tweet has already been posted
+    class AlreadyPosted < Twitter::Error
+      MESSAGE = "Status is a duplicate"
+    end
+  end
+end