diff --git a/samples/generators/open-api/tmdgen.lock b/samples/generators/open-api/tmdgen.lock
index 8f8cd42c..4fdff8d4 100644
--- a/samples/generators/open-api/tmdgen.lock
+++ b/samples/generators/open-api/tmdgen.lock
@@ -3,6 +3,7 @@
 #
 
 version: 1.6.9
+modules: {}
 generatedFiles:
   - ./Petstore/Model.tmd
   - ./Petstore/Pet.tmd