diff --git a/CI/.drone.yml b/CI/.drone.yml
index d45a1a431ea3..5480eb2a9a66 100644
--- a/CI/.drone.yml
+++ b/CI/.drone.yml
@@ -2,8 +2,19 @@ kind: pipeline
 name: default
 
 steps:
-- name: test
+# test Java 11 HTTP client
+- name: java11-test
   image: hirokimatsumoto/alpine-openjdk-11	
   commands:
   - ./mvnw clean install
   - ./mvnw --quiet verify -Psamples.droneio
+# test ocaml petstore client
+- name: ocaml-test
+  image: ocaml/opam2:4.07
+  commands:
+  - sudo apt-get -y install m4
+  - cd samples/client/petstore/ocaml
+  - opam install ppx_deriving_yojson cohttp ppx_deriving cohttp-lwt-unix
+  - eval $(opam env)
+  - sudo chmod -R 777 .
+  - dune build --build-dir=./_build