diff --git a/bin/main.ml b/bin/main.ml
index 28f6539f..68afeee3 100644
--- a/bin/main.ml
+++ b/bin/main.ml
@@ -1131,9 +1131,8 @@ let exec =
       raise Already_reported
     | Some real_prog, _ ->
       let real_prog = Path.to_string real_prog     in
-      let env       = Context.env_for_exec context in
       let argv      = Array.of_list (prog :: args) in
-      restore_cwd_and_execve common real_prog argv env
+      restore_cwd_and_execve common real_prog argv context.env
   in
   ( Term.(const go
           $ common
@@ -1233,7 +1232,7 @@ let utop =
       ) |> Scheduler.go ~log ~common in
     Build_system.finalize build_system;
     restore_cwd_and_execve common utop_path (Array.of_list (utop_path :: args))
-      (Context.env_for_exec context)
+      context.env
   in
   let name_ = Arg.info [] ~docv:"PATH" in
   ( Term.(const go
diff --git a/src/action.ml b/src/action.ml
index f91ac157..30781a6b 100644
--- a/src/action.ml
+++ b/src/action.ml
@@ -735,7 +735,16 @@ let rec exec t ~ectx ~dir ~env ~stdout_to ~stderr_to =
   | Run (Error e, _) ->
     Prog.Not_found.raise e
   | Run (Ok prog, args) ->
-    exec_run ~ectx ~dir ~env ~stdout_to ~stderr_to prog args
+    exec_run ~ectx ~dir ~env:(
+      match ectx.context with
+      | None ->
+        Sexp.code_error "context isn't available to this run action"
+          [ "action", sexp_of_t t
+          ; "dir", Path.sexp_of_t dir
+          ; "env", Env.sexp_of_t env ]
+      | Some ctx ->
+        Env.extend_env ctx.env env
+    ) ~stdout_to ~stderr_to prog args
   | Chdir (dir, t) ->
     exec t ~ectx ~dir ~env ~stdout_to ~stderr_to
   | Setenv (var, value, t) ->
diff --git a/src/context.ml b/src/context.ml
index 3cce4ab6..218e52f7 100644
--- a/src/context.ml
+++ b/src/context.ml
@@ -253,6 +253,32 @@ let create ~(kind : Kind.t) ~path ~env ~name ~merlin ~targets () =
       else
         env
     in
+    let env =
+      let sep = if Sys.win32 then ';' else ':' in
+      let cwd = Sys.getcwd () in
+      let extend_var var v =
+        let v = Filename.concat cwd (Path.to_string v) in
+        match Env.get env var with
+        | None -> (var, v)
+        | Some prev -> (var, sprintf "%s%c%s" v sep prev)
+      in
+      let vars =
+        [ extend_var "CAML_LD_LIBRARY_PATH"
+            (Path.relative
+               (Config.local_install_dir ~context:name)
+               "lib/stublibs")
+        ; extend_var "OCAMLPATH"
+            (Path.relative
+               (Config.local_install_dir ~context:name)
+               "lib")
+        ; extend_var "PATH"
+            (Config.local_install_bin_dir ~context:name)
+        ; extend_var "MANPATH"
+            (Config.local_install_man_dir ~context:name)
+        ]
+      in
+      Env.extend env ~vars:(Env.Map.of_list_exn vars)
+    in
     let stdlib_dir = Path.of_string (Ocaml_config.standard_library ocfg) in
     let natdynlink_supported = Ocaml_config.natdynlink_supported ocfg in
     let version        = Ocaml_config.version ocfg        in
@@ -408,33 +434,6 @@ let install_ocaml_libdir t =
     | None ->
       Fiber.return None
 
-(* CR-someday jdimino: maybe we should just do this for [t.env] directly? *)
-let env_for_exec t =
-  let sep = if Sys.win32 then ';' else ':' in
-  let cwd = Sys.getcwd () in
-  let extend_var var v =
-    let v = Filename.concat cwd (Path.to_string v) in
-    match Env.get t.env var with
-    | None -> (var, v)
-    | Some prev -> (var, sprintf "%s%c%s" v sep prev)
-  in
-  let vars =
-    [ extend_var "CAML_LD_LIBRARY_PATH"
-        (Path.relative
-           (Config.local_install_dir ~context:t.name)
-           "lib/stublibs")
-    ; extend_var "OCAMLPATH"
-        (Path.relative
-           (Config.local_install_dir ~context:t.name)
-           "lib")
-    ; extend_var "PATH"
-        (Config.local_install_bin_dir ~context:t.name)
-    ; extend_var "MANPATH"
-        (Config.local_install_man_dir ~context:t.name)
-    ]
-  in
-  Env.extend t.env ~vars:(Env.Map.of_list_exn vars)
-
 let compiler t (mode : Mode.t) =
   match mode with
   | Byte   -> Some t.ocamlc
diff --git a/src/context.mli b/src/context.mli
index a1b54065..0513d3f7 100644
--- a/src/context.mli
+++ b/src/context.mli
@@ -130,8 +130,6 @@ val opam_config_var : t -> string -> string option Fiber.t
 val install_prefix : t -> Path.t Fiber.t
 val install_ocaml_libdir : t -> Path.t option Fiber.t
 
-val env_for_exec : t -> Env.t
-
 (** Return the compiler needed for this compilation mode *)
 val compiler : t -> Mode.t -> Path.t option