diff --git a/frenetic.opam b/frenetic.opam
index 0be484e63..94d679e8e 100644
--- a/frenetic.opam
+++ b/frenetic.opam
@@ -38,7 +38,7 @@ depends: [
   "ppx_metaquot"
   "ppx_sexp_conv"
   "ppx_tools_versioned"
-  "sedlex"
+  "sedlex" {>= "1.99.4"}
   "sexplib"
   "tcpip"
   "yojson" {>= "1.2.0"}
diff --git a/src/lib/netkat/Lexer.cppo.sedlex.ml b/src/lib/netkat/Lexer.cppo.ml
similarity index 100%
rename from src/lib/netkat/Lexer.cppo.sedlex.ml
rename to src/lib/netkat/Lexer.cppo.ml
diff --git a/src/lib/netkat/jbuild b/src/lib/netkat/jbuild
index 867870506..aae208a7a 100644
--- a/src/lib/netkat/jbuild
+++ b/src/lib/netkat/jbuild
@@ -20,19 +20,15 @@
   (deps    (Tokens.mly))
   (action  (run ${bin:menhir} --only-tokens --infer ${<}))))
 
-;; generate lexer -- temporary hack while ppx_sedlex and ppx_import are incompatible with jbuilder!!
+;; generate lexer -- temporary hack while ppx_import is incompatible with jbuilder!!
 (rule
- ((targets (Lexer.sedlex.ml))
-  (deps    (Lexer.cppo.sedlex.ml Tokens.ml))
+ ((targets (Lexer.ml))
+  (deps    (Lexer.cppo.ml Tokens.ml))
   (action  (run ${bin:cppo} ${<} -n -o ${@}))))
 (rule
  ((targets (Lexer.mli))
   (deps    (Lexer.cppo.mli Tokens.ml))
   (action  (run ${bin:cppo} ${<} -n -o ${@}))))
-(rule
- ((targets (Lexer.ml))
-  (deps    (Lexer.sedlex.ml))
-  (action  (run ${lib:sedlex:ppx_sedlex} ${<} -o ${@}))))
 
 ;; generate parser
 (menhir
@@ -70,6 +66,7 @@
                     ppx_fields_conv
                     ppx_sexp_conv
                     ppx_hash
+                    sedlex.ppx
                     ocaml-migrate-parsetree.driver-main -no-check
                    )))
   (flags (:standard -safe-string))