diff --git a/packages/grpc-native-core/index.d.ts b/packages/grpc-native-core/index.d.ts
index 69c423d8f..2934ce922 100644
--- a/packages/grpc-native-core/index.d.ts
+++ b/packages/grpc-native-core/index.d.ts
@@ -573,12 +573,12 @@ declare module "grpc" {
     /**
      * The server's private key
      */
-    privateKey: Buffer;
+    private_key: Buffer;
 
     /**
      * The server's certificate chain
      */
-    certChain: Buffer;
+    cert_chain: Buffer;
   }
 
   /**
diff --git a/packages/grpc-native-core/index.js b/packages/grpc-native-core/index.js
index 7810b7bff..fa07baebc 100644
--- a/packages/grpc-native-core/index.js
+++ b/packages/grpc-native-core/index.js
@@ -219,8 +219,8 @@ exports.ServerCredentials = grpc.ServerCredentials;
 /**
  * A private key and certificate pair
  * @typedef {Object} grpc.ServerCredentials~keyCertPair
- * @property {Buffer} privateKey The server's private key
- * @property {Buffer} certChain The server's certificate chain
+ * @property {Buffer} private_key The server's private key
+ * @property {Buffer} cert_chain The server's certificate chain
  */
 
 /**