diff --git a/src/main.rs b/src/main.rs
index 468cf8b5..9724377a 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -42,7 +42,7 @@ fn parse_configs(app: Command) -> Result<Config> {
             let mut f = f.split(":");
             if let (Some(n), Some(p), Some(c), Some(s)) = (f.next(), f.next(), f.next(), f.next()) {
                 let case = match c {
-                    "" => None,
+                    "" | "unchanged" | "svd" => None,
                     "p" | "pascal" | "type" => Some(Case::Pascal),
                     "s" | "snake" | "lower" => Some(Case::Snake),
                     "c" | "constant" | "upper" => Some(Case::Constant),