diff --git a/dune b/dune
index 292467727b..7fa05d513d 100644
--- a/dune
+++ b/dune
@@ -4,7 +4,10 @@
    (:standard -w +a-4-40-41-42-44-48-58-66-70))
   (binaries
    (tools/node_wrapper.exe as node)
-   (tools/node_wrapper.exe as node.exe)))
+   (tools/node_wrapper.exe as node.exe))
+  (wasm_of_ocaml
+   (flags
+    (:standard --enable use-js-string))))
  (with-effects
   (js_of_ocaml
    (compilation_mode separate)
diff --git a/tools/ci_setup.ml b/tools/ci_setup.ml
index d64dfbc7fc..d33f15f591 100644
--- a/tools/ci_setup.ml
+++ b/tools/ci_setup.ml
@@ -32,6 +32,9 @@ let dune_workspace =
  (_
   (env-vars (TESTING_FRAMEWORK inline-test))
   (js_of_ocaml (enabled_if false))
+  (wasm_of_ocaml
+   (flags
+    (:standard --enable use-js-string)))
   (flags :standard -warn-error -8-32-34-49-52-55 -w -67-69)))
 |}