diff --git a/src/registry.rs b/src/registry.rs
index 3c94c5b..be2e8f6 100644
--- a/src/registry.rs
+++ b/src/registry.rs
@@ -25,11 +25,6 @@ impl SourceCoopRegistry {
         }
     }
 
-    /// Parse "account:product" bucket name into (account, product).
-    fn parse_bucket_name(name: &str) -> Option<(&str, &str)> {
-        name.split_once(crate::BUCKET_SEPARATOR)
-    }
-
     /// List products for an account via the Source API.
     pub async fn list_products(&self, account: &str) -> Result<Vec<String>, ProxyError> {
         let product_list = crate::cache::get_or_fetch_product_list(
@@ -55,7 +50,9 @@ impl BucketRegistry for SourceCoopRegistry {
         identity: &ResolvedIdentity,
         _operation: &S3Operation,
     ) -> Result<ResolvedBucket, ProxyError> {
-        let (account, product) = Self::parse_bucket_name(name)
+        // Bucket names arrive pre-mapped as "account:product".
+        let (account, product) = name
+            .split_once(crate::BUCKET_SEPARATOR)
             .ok_or_else(|| ProxyError::BucketNotFound(name.to_string()))?;
 
         let subject = match identity {