diff --git a/include/core/matrixFreePDE.h b/include/core/matrixFreePDE.h
index d0687cd1..07724f42 100644
--- a/include/core/matrixFreePDE.h
+++ b/include/core/matrixFreePDE.h
@@ -4,7 +4,6 @@
 // dealii headers
 #include <deal.II/base/config.h>
 #include <deal.II/base/quadrature.h>
-#include <deal.II/base/timer.h>
 #include <deal.II/distributed/solution_transfer.h>
 #include <deal.II/distributed/tria.h>
 #include <deal.II/dofs/dof_handler.h>