diff --git a/src/RadMarshak/test_radiation_marshak.cpp b/src/RadMarshak/test_radiation_marshak.cpp
index c4f4ec104..b7986e508 100644
--- a/src/RadMarshak/test_radiation_marshak.cpp
+++ b/src/RadMarshak/test_radiation_marshak.cpp
@@ -31,7 +31,7 @@ constexpr double alpha_SuOlson = 4.0 * a_rad / eps_SuOlson;
 constexpr double T_initial = 1.0e-2;
 
 template <> struct quokka::EOS_Traits<SuOlsonProblem> {
-	static constexpr double mean_molecular_mass = 1.0;
+	static constexpr double mean_molecular_weight = 1.0;
 	static constexpr double boltzmann_constant = 1.0;
 	static constexpr double gamma = 5. / 3.;
 };
diff --git a/src/RadMarshakCGS/test_radiation_marshak_cgs.cpp b/src/RadMarshakCGS/test_radiation_marshak_cgs.cpp
index 39cdbf0ad..15e208280 100644
--- a/src/RadMarshakCGS/test_radiation_marshak_cgs.cpp
+++ b/src/RadMarshakCGS/test_radiation_marshak_cgs.cpp
@@ -33,7 +33,7 @@ constexpr double alpha_SuOlson = 4.0 * a_rad / eps_SuOlson;
 constexpr double T_initial = 1.0e4; // K
 
 template <> struct quokka::EOS_Traits<SuOlsonProblemCgs> {
-	static constexpr double mean_molecular_mass = C::m_u;
+	static constexpr double mean_molecular_weight = C::m_u;
 	static constexpr double boltzmann_constant = C::k_B;
 	static constexpr double gamma = 5. / 3.;
 };
diff --git a/src/RadMatterCoupling/test_radiation_matter_coupling.cpp b/src/RadMatterCoupling/test_radiation_matter_coupling.cpp
index 3e554b767..1c2582e50 100644
--- a/src/RadMatterCoupling/test_radiation_matter_coupling.cpp
+++ b/src/RadMatterCoupling/test_radiation_matter_coupling.cpp
@@ -31,7 +31,7 @@ template <> struct SimulationData<CouplingProblem> {
 };
 
 template <> struct quokka::EOS_Traits<CouplingProblem> {
-	static constexpr double mean_molecular_mass = C::m_u;
+	static constexpr double mean_molecular_weight = C::m_u;
 	static constexpr double boltzmann_constant = C::k_B;
 	static constexpr double gamma = 5. / 3.;
 };
diff --git a/src/RadMatterCouplingRSLA/test_radiation_matter_coupling_rsla.cpp b/src/RadMatterCouplingRSLA/test_radiation_matter_coupling_rsla.cpp
index 3c7f2e97c..0d774bfc9 100644
--- a/src/RadMatterCouplingRSLA/test_radiation_matter_coupling_rsla.cpp
+++ b/src/RadMatterCouplingRSLA/test_radiation_matter_coupling_rsla.cpp
@@ -33,7 +33,7 @@ template <> struct SimulationData<CouplingProblem> {
 };
 
 template <> struct quokka::EOS_Traits<CouplingProblem> {
-	static constexpr double mean_molecular_mass = C::m_u;
+	static constexpr double mean_molecular_weight = C::m_u;
 	static constexpr double boltzmann_constant = C::k_B;
 	static constexpr double gamma = 5. / 3.;
 };