diff --git a/examples/babel/serverless.yml b/examples/babel/serverless.yml
index f48ff62..dd21145 100644
--- a/examples/babel/serverless.yml
+++ b/examples/babel/serverless.yml
@@ -15,3 +15,4 @@ functions:
       - http:
           method: get
           path: hello
+          integration: lambda
diff --git a/examples/include-external-npm-packages/serverless.yml b/examples/include-external-npm-packages/serverless.yml
index 5cfa396..854bba2 100644
--- a/examples/include-external-npm-packages/serverless.yml
+++ b/examples/include-external-npm-packages/serverless.yml
@@ -18,3 +18,4 @@ functions:
       - http:
           method: GET
           path: first
+          integration: lambda
diff --git a/examples/multiple-entries/serverless.yml b/examples/multiple-entries/serverless.yml
index 5264add..4803a32 100644
--- a/examples/multiple-entries/serverless.yml
+++ b/examples/multiple-entries/serverless.yml
@@ -21,3 +21,4 @@ functions:
       - http:
           method: GET
           path: second
+          integration: lambda
diff --git a/examples/typescript/serverless.yml b/examples/typescript/serverless.yml
index 0be8d95..4dad50a 100644
--- a/examples/typescript/serverless.yml
+++ b/examples/typescript/serverless.yml
@@ -15,3 +15,4 @@ functions:
       - http:
           method: get
           path: hello
+          integration: lambda
diff --git a/lib/serve.js b/lib/serve.js
index 3783711..1e2b461 100644
--- a/lib/serve.js
+++ b/lib/serve.js
@@ -122,7 +122,7 @@ module.exports = {
         }
 
         if (isLambdaProxyIntegration) {
-          res.status(resp.statusCode).send(resp.body);
+          res.status(resp.statusCode || 200).send(resp.body);
         } else {
           res.status(200).send(resp);
         }