diff --git a/cohttp-mirage/src/dune b/cohttp-mirage/src/dune
index cc00817565..03cabcd36a 100644
--- a/cohttp-mirage/src/dune
+++ b/cohttp-mirage/src/dune
@@ -5,4 +5,4 @@
  (preprocess
   (pps ppx_sexp_conv))
  (libraries conduit-mirage cohttp-lwt mirage-channel mirage-kv mirage-flow
-   magic-mime astring))
+   magic-mime astring cstruct))
diff --git a/examples/async/dune b/examples/async/dune
index 109a31026d..2468a0da93 100644
--- a/examples/async/dune
+++ b/examples/async/dune
@@ -1,7 +1,7 @@
 (executables
  (names hello_world receive_post s3_cp)
  (libraries mirage-crypto cohttp-async base async_kernel 
-   core_unix.command_unix))
+   core_unix.command_unix cstruct mirage-crypto-hash))
 
 (alias
  (name runtest)