diff --git a/mldoc.opam b/mldoc.opam
index 52a83342..95793d3f 100644
--- a/mldoc.opam
+++ b/mldoc.opam
@@ -12,9 +12,9 @@ depends: [
   "ocaml" {>= "4.14.0"}
   "angstrom" {= "dev"}
   "cmdliner" {>= "1.1.0"}
-  "core"
-  "core_bench"
-  "core_unix"
+  "core" {os != "win32"}
+  "core_bench" {os != "win32"}
+  "core_unix" {os != "win32"}
   "js_of_ocaml" {>= "5.2.0"}
   "js_of_ocaml-ppx"
   "ppx_deriving_yojson"