diff --git a/projects/miragesdk/examples/https-unikernel/Dockerfile b/projects/miragesdk/examples/https-unikernel/Dockerfile
index 141b20277..99d4122ba 100644
--- a/projects/miragesdk/examples/https-unikernel/Dockerfile
+++ b/projects/miragesdk/examples/https-unikernel/Dockerfile
@@ -1,6 +1,6 @@
 FROM ocaml/opam@sha256:a469435632d0cacbceab799d7e48201b727d025fa1805cbbe210d94233b251ad
 #FROM ocaml/opam:debian-9_ocaml-4.04.0
-RUN opam pin add -yn capnp 'https://github.com/talex5/capnp-ocaml.git#interfaces'
+RUN opam pin add -yn capnp 'https://github.com/talex5/capnp-ocaml.git#demo1'
 RUN opam pin add -yn capnp-rpc 'https://github.com/talex5/capnp-rpc.git#demo1'
 RUN opam pin add -yn capnp-rpc-lwt 'https://github.com/talex5/capnp-rpc.git#demo1'
 RUN opam depext -i -y jbuilder lwt cohttp astring tls capnp camlzip alcotest cohttp
diff --git a/projects/miragesdk/examples/https-unikernel/src/jbuild b/projects/miragesdk/examples/https-unikernel/src/jbuild
index 0eb30fec6..29e48cd29 100644
--- a/projects/miragesdk/examples/https-unikernel/src/jbuild
+++ b/projects/miragesdk/examples/https-unikernel/src/jbuild
@@ -7,19 +7,19 @@ let extra_flags =
   | x -> failwith (Printf.sprintf "JBUILD_STATIC: unknown value %S" x)
   | exception Not_found -> ""
 
-let sexp = Printf.sprintf "
-  (jbuild_version 1) \
-  \
-  (executables ( \
-    (names (main store_main http_main tls_main)) \
-    (libraries (capnp-rpc-lwt cohttp.lwt irmin-unix cmdliner fmt.tty)) \
-    (flags (:standard %s)) \
-  )) \
-  (rule \
-   ((targets (proto.ml proto.mli)) \
-    (deps (proto.capnp)) \
-    (action  (run capnpc -o ocaml ${<})))) \
-" extra_flags
+let sexp = Printf.sprintf {|
+  (jbuild_version 1)
+
+  (executables (
+    (names (main store_main http_main tls_main))
+    (libraries (capnp-rpc-lwt cohttp.lwt irmin-unix cmdliner fmt.tty))
+    (flags (:standard -w -53-55 %s))
+  ))
+  (rule
+   ((targets (proto.ml proto.mli))
+    (deps (proto.capnp))
+    (action  (run capnpc -o ocaml ${<}))))
+|} extra_flags
 
 let () =
   send sexp