diff --git a/services/dynamodb/src/main/resources/codegen-resources/dynamodb/customization.config b/services/dynamodb/src/main/resources/codegen-resources/dynamodb/customization.config
index b777570861ea..55f01d7f0e25 100644
--- a/services/dynamodb/src/main/resources/codegen-resources/dynamodb/customization.config
+++ b/services/dynamodb/src/main/resources/codegen-resources/dynamodb/customization.config
@@ -36,6 +36,5 @@
   "customRetryStrategy" : "software.amazon.awssdk.services.dynamodb.DynamoDbRetryPolicy",
   "enableEndpointDiscoveryMethodRequired": true,
   "enableGenerateCompiledEndpointRules": true,
-  "enableFastUnmarshaller": false,
   "enableEndpointProviderUriCaching": true
 }
diff --git a/services/dynamodb/src/main/resources/codegen-resources/dynamodbstreams/customization.config b/services/dynamodb/src/main/resources/codegen-resources/dynamodbstreams/customization.config
index 2a1a749111ae..db0fa645ec87 100644
--- a/services/dynamodb/src/main/resources/codegen-resources/dynamodbstreams/customization.config
+++ b/services/dynamodb/src/main/resources/codegen-resources/dynamodbstreams/customization.config
@@ -20,6 +20,5 @@
     "verifiedSimpleMethods" : [
         "listStreams"
     ],
-    "enableGenerateCompiledEndpointRules": true,
-    "enableFastUnmarshaller": false
+    "enableGenerateCompiledEndpointRules": true
 }