diff --git a/src/clob/client.rs b/src/clob/client.rs
index 2697bf02..21eb4ece 100644
--- a/src/clob/client.rs
+++ b/src/clob/client.rs
@@ -1563,7 +1563,7 @@ impl<K: Kind> Client<Authenticated<K>> {
         let request = self
             .client()
             .request(Method::DELETE, format!("{}order", self.host()))
-            .json(&json!({ "orderId": order_id }))
+            .json(&json!({ "orderID": order_id }))
             .build()?;
         let headers = self.create_headers(&request).await?;
 
diff --git a/tests/clob.rs b/tests/clob.rs
index f4bacadb..c6f3f66e 100644
--- a/tests/clob.rs
+++ b/tests/clob.rs
@@ -1826,7 +1826,7 @@ mod authenticated {
                 .header(POLY_ADDRESS, client.address().to_string().to_lowercase())
                 .header(POLY_API_KEY, API_KEY)
                 .header(POLY_PASSPHRASE, PASSPHRASE)
-                .json_body(json!({ "orderId": "1" }));
+                .json_body(json!({ "orderID": "1" }));
             then.status(StatusCode::OK).json_body(json!({
                     "canceled": [],
                     "notCanceled": {
@@ -1862,7 +1862,7 @@ mod authenticated {
                 .header(POLY_ADDRESS, client.address().to_string().to_lowercase())
                 .header(POLY_API_KEY, API_KEY)
                 .header(POLY_PASSPHRASE, PASSPHRASE)
-                .json_body(json!({ "orderId": "1" }));
+                .json_body(json!({ "orderID": "1" }));
             then.status(StatusCode::OK).json_body(json!({
                     "canceled": [],
                     "not_canceled": {