diff --git a/blob/gcsblob/gcsblob.go b/blob/gcsblob/gcsblob.go
index 376e3680a1..172359af41 100644
--- a/blob/gcsblob/gcsblob.go
+++ b/blob/gcsblob/gcsblob.go
@@ -435,7 +435,7 @@ func (b *bucket) ErrorCode(err error) gcerrors.ErrorCode {
 			return gcerrors.ResourceExhausted
 		}
 	}
-	return gcerrors.Unknown
+	return gcerr.GRPCCode(err)
 }
 
 func (b *bucket) Close() error {