diff --git a/src/dune_rules/expander.ml b/src/dune_rules/expander.ml
index 6cc48f470ac8..618784fda085 100644
--- a/src/dune_rules/expander.ml
+++ b/src/dune_rules/expander.ml
@@ -702,10 +702,6 @@ module With_deps_if_necessary = struct
     Value.to_string v ~dir:(Path.build t.dir)
 end
 
-let make_eval_blang ~f ~dir = function
-  | Blang.Const x -> Memo.Build.return x (* common case *)
-  | blang -> Blang.eval blang ~dir:(Path.build dir) ~f
-
 module With_reduced_var_set = struct
   open Memo.Build.O
 
@@ -737,9 +733,9 @@ module With_reduced_var_set = struct
       ~f:(expand_pform_opt ~context ~bindings:Pform.Map.empty ~dir)
 
   let eval_blang ~context ~dir blang =
-    make_eval_blang
+    Blang.eval
       ~f:(expand_pform ~context ~bindings:Pform.Map.empty ~dir)
-      ~dir blang
+      ~dir:(Path.build dir) blang
 end
 
 let expand_and_eval_set t set ~standard =
@@ -754,6 +750,6 @@ let expand_and_eval_set t set ~standard =
       s)
 
 let eval_blang t blang =
-  make_eval_blang ~f:(No_deps.expand_pform t) ~dir:t.dir blang
+  Blang.eval ~f:(No_deps.expand_pform t) ~dir:(Path.build t.dir) blang
 
 let find_package t pkg = t.find_package pkg