diff --git a/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
index 890eb156..4771c3eb 100644
--- a/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
+++ b/src/Backends/Helmholtz/HelmholtzEOSMixtureBackend.cpp
@@ -2344,9 +2344,11 @@ void HelmholtzEOSMixtureBackend::calc_all_alphar_deriv_cache(const std::vector<l
         for (std::size_t i = 0; i < N; ++i){
             HelmholtzDerivatives derivs = components[i]->pEOS->alphar.all(tau, delta);
             long double xi = mole_fractions[i];
-            long double R_u_ratio = 1;
+            long double R_u_ratio;
             if (get_config_bool(NORMALIZE_GAS_CONSTANTS)){
                 R_u_ratio = components[0]->pEOS->R_u/R_u_CODATA;
+            }else{
+                R_u_ratio = 1;
             }
             summer_base += xi*derivs.alphar;
             summer_dDelta += xi*derivs.dalphar_ddelta;
diff --git a/src/Configuration.cpp b/src/Configuration.cpp
index ffb90f3b..f92efa46 100644
--- a/src/Configuration.cpp
+++ b/src/Configuration.cpp
@@ -67,7 +67,7 @@ void set_config_as_json(rapidjson::Value &val){
             std::string s = std::string(it->name.GetString());
             configuration_keys key = config_string_to_key(s);
             // Try to retrieve the item from the config for this key
-            ConfigurationItem & item = config.get_item(key);
+            config.get_item(key);
         }
         catch(std::exception &e)
         {