diff --git a/slides/problem.md b/slides/problem.md
index 823c06caad488a46d2273301d70077ef5ea29500..bb9716733cd378c562cd3ccdc8d4875e0b570e2d 100644
--- a/slides/problem.md
+++ b/slides/problem.md
@@ -652,4 +652,4 @@ Exercise about setting boundary conditions, the problem file etc:
 
 Exercise for the main-files:
 
-* Go to [https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/tree/master/exercises/exercise-mainfile](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/tree/master/exercises/exercise-basic) and check out the README
+* Go to [https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/tree/master/exercises/exercise-mainfile](https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/-/tree/master/exercises/exercise-mainfile) and check out the README