diff --git a/pkgs/tools/networking/easyrsa/default.nix b/pkgs/tools/networking/easyrsa/default.nix
index bb59bb5b165e..e49c32aac704 100644
--- a/pkgs/tools/networking/easyrsa/default.nix
+++ b/pkgs/tools/networking/easyrsa/default.nix
@@ -26,6 +26,7 @@ stdenv.mkDerivation rec {
 
   # Make sane defaults and patch default config vars
   postInstall = ''
+    cp $out/share/easy-rsa/openssl-1.0.0.cnf $out/share/easy-rsa/openssl.cnf
     for prog in $(find "$out/share/easy-rsa" -executable -type f); do
       makeWrapper "$prog" "$out/bin/$(basename $prog)" \
         --set EASY_RSA "$out/share/easy-rsa" \