diff --git a/cloudformation/lambda.yml b/cloudformation/lambda.yml
index 7af09ac..26e20b2 100644
--- a/cloudformation/lambda.yml
+++ b/cloudformation/lambda.yml
@@ -153,14 +153,14 @@ Resources:
       Description: Resume Book API Gateway
       AlwaysDeploy: True
       DefinitionBody:
-        Fn::Sub:
-          - Fn::Transform:
+        !Sub:
+          - !Transform
             Name: AWS::Include
             Parameters:
-              Location: ../docs/swagger-resume-book.yml
+              Location: '../docs/swagger-resume-book.yml'
           - AccountId: !Ref AWS::AccountId
-          - Region: !Ref AWS::Region
-          - LambdaFunctionName: !Ref LambdaFunctionName
+            Region: !Ref AWS::Region
+            LambdaFunctionName: !Ref LambdaFunctionName
 
       Auth:
         Authorizers: