diff --git a/CHANGES.md b/CHANGES.md
index 32094b7d75a4..43acdeb377fe 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -15,6 +15,9 @@ Unreleased
 - Fix `dune-package` installation when META templates are present (#3743, fixes
   #3746, @rgrinberg)
 
+- Fix `ppx.exe` being compiled for the wrong target when cross-compiling
+  (#3698, @toots)
+
 2.7.0 (13/08/2020)
 ------------------
 
diff --git a/src/dune_rules/preprocessing.ml b/src/dune_rules/preprocessing.ml
index 0c330358b85a..cec687c8af24 100644
--- a/src/dune_rules/preprocessing.ml
+++ b/src/dune_rules/preprocessing.ml
@@ -395,6 +395,9 @@ let gen_rules sctx components =
 
 let ppx_driver_exe sctx libs =
   let key = Digest.to_string (Key.Decoded.of_libs libs |> Key.encode) in
+  (* Make sure to compile ppx.exe for the compiling host.
+     See: #2252, #2286 and #3698 *)
+  let sctx = SC.host sctx in
   ppx_exe sctx ~key
 
 let get_cookies ~loc ~expander ~lib_name libs =