diff --git a/src/ImplicitAssembly.hpp b/src/ImplicitAssembly.hpp
index 9bd79d88..88f7ac11 100644
--- a/src/ImplicitAssembly.hpp
+++ b/src/ImplicitAssembly.hpp
@@ -39,7 +39,6 @@
 #include <cstddef>
 #include <algorithm>
 #include <vector>
-#include <dune/istl/io.hh>
 
 namespace Opm {
     template <class Model>