diff --git a/test/porousmediumflow/2pncmin/implicit/nonisothermal/problem.hh b/test/porousmediumflow/2pncmin/implicit/nonisothermal/problem.hh
index ecb694b7a6d4b8e2dd21baa37fca66225b67e92b..04d8d7df54ed1ba1fa175ec02b7291d9d8b7fa14 100644
--- a/test/porousmediumflow/2pncmin/implicit/nonisothermal/problem.hh
+++ b/test/porousmediumflow/2pncmin/implicit/nonisothermal/problem.hh
@@ -36,6 +36,7 @@
 #include <dumux/porousmediumflow/2pncmin/model.hh>
 #include <dumux/porousmediumflow/problem.hh>
 #include <dumux/material/fluidsystems/brineair.hh>
+#include <dumux/io/gnuplotinterface.hh>
 
 #include <dumux/material/components/nacl.hh>
 #include <dumux/material/components/granite.hh>