1 files changed, 4 insertions, 0 deletions
diff --git a/src/rust/protover/errors.rs b/src/rust/protover/errors.rs
index 71fbc53e17..f26a48b019 100644
--- a/src/rust/protover/errors.rs
+++ b/src/rust/protover/errors.rs
@@ -18,6 +18,7 @@ pub enum ProtoverError {
     ExceedsExpansionLimit,
     UnknownProtocol,
     ExceedsNameLimit,
+    InvalidProtocol,
 }
 
 /// Descriptive error messages for `ProtoverError` variants.
@@ -48,6 +49,9 @@ impl Display for ProtoverError {
             ProtoverError::ExceedsNameLimit => {
                 write!(f, "An unrecognised protocol name was too long.")
             }
+            ProtoverError::InvalidProtocol => {
+                write!(f, "A protocol name includes invalid characters.")
+            }
         }
     }
 }