diff --git a/courses/fundamentals_of_ada/standard_course.txt b/courses/fundamentals_of_ada/standard_course.txt
index 51c6e04fd..7d652218c 100644
--- a/courses/fundamentals_of_ada/standard_course.txt
+++ b/courses/fundamentals_of_ada/standard_course.txt
@@ -17,8 +17,7 @@
 140_access_types.rst
 160_genericity.rst
 170_tagged_derivation-intro.rst
-180_polymorphism.rst
 190_exceptions.rst
-230_interfacing_with_c.rst
+280_low_level_programming.rst
 240_tasking.rst
 920_reference_material.rst