diff --git a/src/samplefunctional.hh b/src/samplefunctional.hh
index 8e9db33b07dde806443075b07dec776c91c69763..8bcf1cfff503cde50d35906a37ed33ad715aa06d 100644
--- a/src/samplefunctional.hh
+++ b/src/samplefunctional.hh
@@ -3,6 +3,8 @@
 #ifndef SAMPLE_FUNCTIONAL_HH
 #define SAMPLE_FUNCTIONAL_HH
 
+#include <dune/common/fmatrix.hh>
+#include <dune/common/fvector.hh>
 #include <dune/common/stdstreams.hh>
 
 #include <dune/fufem/interval.hh>