diff --git a/src/metafiles/cvs.rs b/src/metafiles/cvs.rs
index d63d35cf..b56ab5fc 100644
--- a/src/metafiles/cvs.rs
+++ b/src/metafiles/cvs.rs
@@ -1,4 +1,4 @@
-use std::{fmt, str::FromStr};
+use std::{borrow::Cow, fmt, str::FromStr};
 
 use miette::Diagnostic;
 use once_cell::sync::Lazy;
@@ -116,7 +116,7 @@ impl<'de> Deserialize<'de> for CrateVersionSource {
     where
         D: Deserializer<'de>,
     {
-        let s = <&str>::deserialize(deserializer)?;
-        Self::from_str(s).map_err(serde::de::Error::custom)
+        let s = Cow::<'_, str>::deserialize(deserializer)?;
+        Self::from_str(&s).map_err(serde::de::Error::custom)
     }
 }