diff --git a/externals/REFPROP-headers b/externals/REFPROP-headers
index 62a12441..c2d31035 160000
--- a/externals/REFPROP-headers
+++ b/externals/REFPROP-headers
@@ -1 +1 @@
-Subproject commit 62a12441151511e1bcf19b1d2c310c96195ec861
+Subproject commit c2d31035f47e9027d06ed208392458d71e3fce02