diff --git a/Cargo.toml b/Cargo.toml
index 112c29ba9c3..e3afcaaad07 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -136,6 +136,7 @@ serde = { version = "1.0", default-features = false, features = [
 ] }
 serde_json = { version = "1.0", default-features = false, features = ["alloc"] }
 serde_with = "3.3.0"
+serde_repr = "0.1"
 
 ## misc-testing
 arbitrary = "1.3"
diff --git a/crates/rpc-types-trace/Cargo.toml b/crates/rpc-types-trace/Cargo.toml
index 7181ff4755f..96728037279 100644
--- a/crates/rpc-types-trace/Cargo.toml
+++ b/crates/rpc-types-trace/Cargo.toml
@@ -25,6 +25,7 @@ alloy-serde.workspace = true
 
 serde.workspace = true
 serde_json.workspace = true
+serde_repr.workspace = true
 thiserror.workspace = true
 
 [dev-dependencies]
diff --git a/crates/rpc-types-trace/src/otterscan.rs b/crates/rpc-types-trace/src/otterscan.rs
index d756b833a40..f30456aa99a 100644
--- a/crates/rpc-types-trace/src/otterscan.rs
+++ b/crates/rpc-types-trace/src/otterscan.rs
@@ -6,9 +6,11 @@
 use alloy_primitives::{Address, Bloom, Bytes, TxHash, B256, U256};
 use alloy_rpc_types_eth::{Block, Header, Rich, Transaction, TransactionReceipt, Withdrawal};
 use serde::{Deserialize, Serialize};
+use serde_repr::{Deserialize_repr, Serialize_repr};
 
 /// Operation type enum for `InternalOperation` struct
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Serialize_repr, Deserialize_repr)]
+#[repr(u8)]
 pub enum OperationType {
     /// Operation Transfer
     OpTransfer = 0,
@@ -237,4 +239,15 @@ mod tests {
 
         let _receipt: OtsTransactionReceipt = serde_json::from_str(s).unwrap();
     }
+
+    #[test]
+    fn test_otterscan_interal_operation() {
+        let s = r#"{
+          "type": 0,
+          "from": "0xea593b730d745fb5fe01b6d20e6603915252c6bf",
+          "to": "0xcc3d455481967dc97346ef1771a112d7a14c8f12",
+          "value": "0xee846f9305c00"
+        }"#;
+        let _op: InternalOperation = serde_json::from_str(s).unwrap();
+    }
 }