diff --git a/src/Backends/REFPROP/REFPROPMixtureBackend.cpp b/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
index 387fd810c5..b213da8b56 100644
--- a/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
+++ b/src/Backends/REFPROP/REFPROPMixtureBackend.cpp
@@ -857,10 +857,10 @@ void REFPROPMixtureBackend::calc_phase_envelope(const std::string &type)
         PhaseEnvelope.Q.push_back(static_cast<double>(y > rho_molL));
         isp = nc + 4;
         SPLNVALdll(&isp, &iderv, &rho_molL, &y, &ierr, herr, errormessagelength);
-        PhaseEnvelope.hmolar_vap.push_back(y*1000);
+        PhaseEnvelope.hmolar_vap.push_back(y);
         isp = nc + 5;
         SPLNVALdll(&isp, &iderv, &rho_molL, &y, &ierr, herr, errormessagelength);
-        PhaseEnvelope.smolar_vap.push_back(y*1000);
+        PhaseEnvelope.smolar_vap.push_back(y);
     }
 }
 CoolPropDbl REFPROPMixtureBackend::calc_cpmolar_idealgas(void)