diff --git a/src/core/opamSystem.mli b/src/core/opamSystem.mli
index d3bf7a4f2c4..d9c714bb8c6 100644
--- a/src/core/opamSystem.mli
+++ b/src/core/opamSystem.mli
@@ -196,6 +196,9 @@ val get_cygpath_function: command:string -> (string -> string) lazy_t
     otherwise. *)
 val get_cygpath_path_transform: (pathlist:bool -> string -> string) lazy_t
 
+(** Applies the cygpath command to the argument. Requires cygpath to be resolved. *)
+val apply_cygpath: string -> string
+
 (** [command cmd] executes the command [cmd] in the correct OPAM
     environment. *)
 val command: ?verbose:bool -> ?env:string array -> ?name:string ->