diff --git a/packages/pa_ppx_q_ast/pa_ppx_q_ast.0.09/opam b/packages/pa_ppx_q_ast/pa_ppx_q_ast.0.09/opam
index b7053430d674..6f314457ffa2 100644
--- a/packages/pa_ppx_q_ast/pa_ppx_q_ast.0.09/opam
+++ b/packages/pa_ppx_q_ast/pa_ppx_q_ast.0.09/opam
@@ -29,6 +29,7 @@ depends: [
   "pcre" { >= "7.4.3" }
   "ounit" {with-test}
   "bos" { >= "0.2.0" }
+  "cppo"
 ]
 build: [
   [make "sys"]