diff --git a/flow_parser.opam b/flow_parser.opam
index 229c86fb9..563541782 100644
--- a/flow_parser.opam
+++ b/flow_parser.opam
@@ -14,6 +14,7 @@ depends: [
   "ppx_deriving" {build}
   "ppx_gen_rec" {build}
   "wtf8"
+  "camlp-streams"
 ]
 dev-repo: "git+https://github.com/facebook/flow.git"
 synopsis: "The Flow parser is a JavaScript parser written in OCaml"
diff --git a/src/third-party/ocaml-sourcemaps/src/dune b/src/third-party/ocaml-sourcemaps/src/dune
index 9b920401d..fde1d33c6 100644
--- a/src/third-party/ocaml-sourcemaps/src/dune
+++ b/src/third-party/ocaml-sourcemaps/src/dune
@@ -1,4 +1,4 @@
 (library
  (name flow_third_party_sourcemaps)
  (wrapped false)
- (libraries flow_third_party_vlq))
+ (libraries flow_third_party_vlq camlp-streams))
diff --git a/src/third-party/ocaml-vlq/src/dune b/src/third-party/ocaml-vlq/src/dune
index ba49dfba4..70f766b39 100644
--- a/src/third-party/ocaml-vlq/src/dune
+++ b/src/third-party/ocaml-vlq/src/dune
@@ -1,3 +1,4 @@
 (library
  (name flow_third_party_vlq)
- (wrapped false))
+ (wrapped false)
+ (libraries camlp-streams))