diff --git a/opm/core/utility/MonotCubicInterpolator.cpp b/opm/core/utility/MonotCubicInterpolator.cpp
index 332ead06..1d50b84c 100644
--- a/opm/core/utility/MonotCubicInterpolator.cpp
+++ b/opm/core/utility/MonotCubicInterpolator.cpp
@@ -30,7 +30,8 @@
 */
 
 
-#include "MonotCubicInterpolator.hpp"
+#include <opm/core/utility/MonotCubicInterpolator.hpp>
+
 #include <iostream>
 #include <iomanip>
 #include <fstream>