diff --git a/ebos/eclequilinitializer.hh b/ebos/eclequilinitializer.hh
index f29163688..1222d6f4a 100644
--- a/ebos/eclequilinitializer.hh
+++ b/ebos/eclequilinitializer.hh
@@ -28,7 +28,7 @@
 #ifndef EWOMS_ECL_EQUIL_INITIALIZER_HH
 #define EWOMS_ECL_EQUIL_INITIALIZER_HH
 
-#include "equil/initStateEquil.hpp"
+#include "equil/initstateequil.hh"
 
 #include <ewoms/common/propertysystem.hh>
 
diff --git a/ebos/equil/EquilibrationHelpers.hpp b/ebos/equil/equilibrationhelpers.hh
similarity index 100%
rename from ebos/equil/EquilibrationHelpers.hpp
rename to ebos/equil/equilibrationhelpers.hh
diff --git a/ebos/equil/initStateEquil.hpp b/ebos/equil/initstateequil.hh
similarity index 99%
rename from ebos/equil/initStateEquil.hpp
rename to ebos/equil/initstateequil.hh
index e883ea5fe..0fd033ea3 100644
--- a/ebos/equil/initStateEquil.hpp
+++ b/ebos/equil/initstateequil.hh
@@ -29,8 +29,8 @@
 #ifndef EWOMS_INITSTATEEQUIL_HH
 #define EWOMS_INITSTATEEQUIL_HH
 
-#include "EquilibrationHelpers.hpp"
-#include "RegionMapping.hpp"
+#include "equilibrationhelpers.hh"
+#include "regionmapping.hh"
 
 #include <ewoms/common/propertysystem.hh>
 
diff --git a/ebos/equil/RegionMapping.hpp b/ebos/equil/regionmapping.hh
similarity index 100%
rename from ebos/equil/RegionMapping.hpp
rename to ebos/equil/regionmapping.hh