diff --git a/src/client/opamTest.ml b/src/client/opamTest.ml
new file mode 100644
index 00000000000..a0e372659fc
--- /dev/null
+++ b/src/client/opamTest.ml
@@ -0,0 +1 @@
+let toto = fun () -> "nothiong!!"
diff --git a/src/client/opamTest.mli b/src/client/opamTest.mli
new file mode 100644
index 00000000000..0b5a30d9cac
--- /dev/null
+++ b/src/client/opamTest.mli
@@ -0,0 +1 @@
+val toto : unit -> string