diff --git a/src/cmap/auth/mongodb_aws.ts b/src/cmap/auth/mongodb_aws.ts
index d034f425d17..5b640d77810 100644
--- a/src/cmap/auth/mongodb_aws.ts
+++ b/src/cmap/auth/mongodb_aws.ts
@@ -148,7 +148,7 @@ export class MongoDBAWS extends AuthProvider {
 
     const saslContinue = {
       saslContinue: 1,
-      conversationId: 1,
+      conversationId: saslStartResponse.conversationId,
       payload: BSON.serialize(payload, bsonOptions)
     };