diff --git a/main.go b/main.go
index a264766..fe54a56 100644
--- a/main.go
+++ b/main.go
@@ -374,6 +374,7 @@ func (l *LocalServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	req := events.APIGatewayProxyRequest{
 		Body: string(body),
+		Headers: make(map[string]string),
 	}
 	for k, v := range r.Header {
 		req.Headers[strings.ToLower(k)] = v[0]