diff --git a/.drone.yml b/.drone.yml
index 19bbc53..8799752 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -72,6 +72,7 @@ steps:
       - dotnet new tool-manifest
       - dotnet tool install NSwag.ConsoleCore
       - dotnet restore WF_EF_Api/WF_EF_Api.sln
+      - dotnet clean  WF_EF_Api/WfApi/WfApi.csproj
       - cd WF_EF_Api/WfApi
       - dotnet nswag aspnetcore2openapi /output:/doc/swagger.json
     depends_on: [clone, restore & build]