diff --git a/rust/processor/src/config.rs b/rust/processor/src/config.rs
index 9d2d69c73..9412f357a 100644
--- a/rust/processor/src/config.rs
+++ b/rust/processor/src/config.rs
@@ -50,6 +50,7 @@ pub struct IndexerGrpcProcessorConfig {
     #[serde(default)]
     pub transaction_filter: TransactionFilter,
     // String vector for deprecated tables to skip db writes
+    #[serde(default)]
     pub deprecated_tables: HashSet<String>,
 }