diff --git a/src/Backends/REFPROP/REFPROPMixtureBackend.cpp b/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
index bc64abae..a7be87d0 100644
--- a/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
+++ b/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
@@ -1810,8 +1810,8 @@ TEST_CASE("Check REFPROP and CoolProp values agree","[REFPROP]")
 
             double delta_a1 = (s_CP-s_RP)/(S1->gas_constant()/S1->molar_mass());
             double delta_a2 = -(h_CP - h_RP)/(S1->gas_constant()/S1->molar_mass()*S1->get_reducing_state().T);
-            CAPTURE(delta_a1);
-            CAPTURE(delta_a2);
+            CAPTURE(format("%0.16f",delta_a1));
+            CAPTURE(format("%0.16f",delta_a2));
 
             CAPTURE(Name);
             CAPTURE(RPName);
diff --git a/src/CoolProp.cpp b/src/CoolProp.cpp
index 404ebb3b..13f3fd04 100644
--- a/src/CoolProp.cpp
+++ b/src/CoolProp.cpp
@@ -543,7 +543,7 @@ TEST_CASE("Check inputs to PropsSI","[PropsSI]")
         CHECK(ValidNumber(CoolProp::PropsSI("T","P",101325,"Q",0,"R410A.mix")));
     };
     SECTION("Single state, single output, predefined mixture from REFPROP"){
-        CHECK(ValidNumber(CoolProp::PropsSI("T","P",101325,"Q",0,"REFPROP::R410A.mix")));
+        CHECK(ValidNumber(CoolProp::PropsSI("T","P",101325,"Q",0,"REFPROP::R410A.MIX")));
     };
     SECTION("Single state, single output, bad predefined mixture from REFPROP"){
         CHECK(!ValidNumber(CoolProp::PropsSI("T","P",101325,"Q",0,"REFPROP::RRRRRR.mix")));