diff --git a/Makefile.am b/Makefile.am
index eff335f2..cfe4a9b0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -90,6 +90,8 @@ opm/core/utility/parameters/ParameterRequirement.hpp    \
 opm/core/utility/parameters/ParameterStrings.hpp        \
 opm/core/utility/parameters/ParameterTools.hpp          \
 opm/core/utility/parameters/ParameterXML.hpp            \
+opm/core/utility/parameters/tinyxml/tinystr.h           \
+opm/core/utility/parameters/tinyxml/tinyxml.h           \
 opm/core/utility/RootFinders.hpp                        \
 opm/core/utility/SparseTable.hpp                        \
 opm/core/utility/SparseVector.hpp                       \