diff --git a/lib/syntax/dune b/lib/syntax/dune
index e48d631..927b584 100644
--- a/lib/syntax/dune
+++ b/lib/syntax/dune
@@ -3,7 +3,9 @@
  (libraries sexplib menhirLib common)
  (inline_tests)
  (preprocess
-  (pps ppx_deriving.show ppx_sexp_conv ppx_inline_test ppx_jane)))
+  (pps ppx_deriving.show ppx_sexp_conv ppx_inline_test ppx_jane))
+ (instrumentation
+  (backend bisect_ppx)))
 
 (ocamllex lexer)