diff --git a/programs/server/Server.cpp b/programs/server/Server.cpp
index 574e9bfa62e..4e9b74a5077 100644
--- a/programs/server/Server.cpp
+++ b/programs/server/Server.cpp
@@ -748,8 +748,8 @@ try
     else
     {
         const String config_path = config().getString("config-file", "config.xml");
-        const auto config_dir = std::filesystem::path{config_path}.remove_filename();
-        setenv("OPENSSL_CONF", config_dir.string() + "openssl.conf", true);
+        const auto config_dir = std::filesystem::path{config_path}.replace_filename("openssl.conf");
+        setenv("OPENSSL_CONF", config_dir.string(), true);
     }
 #endif