diff --git a/compiler/dcalc/dune b/compiler/dcalc/dune
index a5caa02e..7e870346 100644
--- a/compiler/dcalc/dune
+++ b/compiler/dcalc/dune
@@ -9,9 +9,7 @@
   ubase
   catala.runtime_ocaml
   shared_ast
-  scopelang)
- (preprocess
-  (pps visitors.ppx)))
+  scopelang))
 
 (documentation
  (package catala)
diff --git a/compiler/lcalc/dune b/compiler/lcalc/dune
index 66ff93d3..26cfc67e 100644
--- a/compiler/lcalc/dune
+++ b/compiler/lcalc/dune
@@ -1,9 +1,7 @@
 (library
  (name lcalc)
  (public_name catala.lcalc)
- (libraries bindlib ubase dcalc scopelang catala.runtime_ocaml)
- (preprocess
-  (pps visitors.ppx)))
+ (libraries bindlib ubase dcalc scopelang catala.runtime_ocaml))
 
 (documentation
  (package catala)