diff --git a/opm/models/blackoil/blackoildiffusionmodule.hh b/opm/models/blackoil/blackoildiffusionmodule.hh
index 8e3dc8867..4d77be591 100644
--- a/opm/models/blackoil/blackoildiffusionmodule.hh
+++ b/opm/models/blackoil/blackoildiffusionmodule.hh
@@ -25,8 +25,8 @@
  *
  * \brief Classes required for molecular diffusion.
  */
-#ifndef EWOMS_DIFFUSION_MODULE_HH
-#define EWOMS_DIFFUSION_MODULE_HH
+#ifndef OPM_BLACKOIL_DIFFUSION_MODULE_HH
+#define OPM_BLACKOIL_DIFFUSION_MODULE_HH
 
 #include <opm/models/discretization/common/fvbaseproperties.hh>
 
diff --git a/opm/models/common/diffusionmodule.hh b/opm/models/common/diffusionmodule.hh
index f04bf55ba..c70fd3abf 100644
--- a/opm/models/common/diffusionmodule.hh
+++ b/opm/models/common/diffusionmodule.hh
@@ -25,8 +25,8 @@
  *
  * \brief Classes required for molecular diffusion.
  */
-#ifndef EWOMS_DIFFUSION_MODULE_HH
-#define EWOMS_DIFFUSION_MODULE_HH
+#ifndef OPM_DIFFUSION_MODULE_HH
+#define OPM_DIFFUSION_MODULE_HH
 
 #include <opm/models/discretization/common/fvbaseproperties.hh>
 #include <opm/models/common/quantitycallbacks.hh>