diff --git a/src/TNL/Problems/Problem.h b/src/TNL/Problems/Problem.h
index 6ffda6b3bd7b985ea7ad7e5e9376e398b76a985e..66fde0f771297b5ef68804ae63cb58a9440fda7c 100644
--- a/src/TNL/Problems/Problem.h
+++ b/src/TNL/Problems/Problem.h
@@ -10,8 +10,6 @@
 
 #pragma once
 
-#include <TNL/Matrices/SlicedEllpack.h>
-
 namespace TNL {
 namespace Problems {