diff --git a/litellm-rust/crates/cache/src/error.rs b/litellm-rust/crates/cache/src/error.rs
index ff3ff6572d4..2418ab978dc 100644
--- a/litellm-rust/crates/cache/src/error.rs
+++ b/litellm-rust/crates/cache/src/error.rs
@@ -6,4 +6,6 @@ pub enum Error {
     InvalidEntry,
     #[error("flushing Redis requires an explicit namespace")]
     UnscopedFlush,
+    #[error("cache backend does not support this operation")]
+    UnsupportedOperation,
 }