diff --git a/dune/tectonic/curvedfunction.hh b/dune/tectonic/curvedfunction.hh
index 9d5fb281f9651484e23b7ca3754fcbb278591792..34ce4924a4ed68da58dff6f0277e807fcb3a3060 100644
--- a/dune/tectonic/curvedfunction.hh
+++ b/dune/tectonic/curvedfunction.hh
@@ -1,6 +1,8 @@
 #ifndef CURVED_FUNCTION_HH
 #define CURVED_FUNCTION_HH
 
+#include <dune/fufem/interval.hh>
+
 namespace Dune {
 template <class NonlinearityType> class CurvedFunction {
   typedef typename NonlinearityType::VectorType VectorType;