diff --git a/ppx_custom_printf/src/gen/dune b/ppx_custom_printf/src/gen/dune
index 4cff3f2..fba088a 100644
--- a/ppx_custom_printf/src/gen/dune
+++ b/ppx_custom_printf/src/gen/dune
@@ -1,3 +1,4 @@
 (executables (names gen)
+ (modes byte)
  (libraries str compiler-libs.common compiler-libs.toplevel)
- (preprocess no_preprocessing))
\ No newline at end of file
+ (preprocess no_preprocessing))