diff --git a/docs/codeql/ql-language-reference/types.rst b/docs/codeql/ql-language-reference/types.rst
index d2d79fe8409b..005aab370b2e 100644
--- a/docs/codeql/ql-language-reference/types.rst
+++ b/docs/codeql/ql-language-reference/types.rst
@@ -422,7 +422,7 @@ final extensions leave the extended type unchanged:
 
 .. code-block:: ql
 
-    from OneTwoTree o
+    from OneTwoThree o
     select o, o.getAString()
 
 +---+-------------------------+