diff --git a/crc.opam b/crc.opam
index 7923009..c691ce2 100644
--- a/crc.opam
+++ b/crc.opam
@@ -1,15 +1,13 @@
 opam-version: "2.0"
 name: "crc"
+synopsis: "CRC implementation supporting strings and cstructs"
+license: "ISC"
+maintainer: "xapi-project maintainers"
 authors: [ "David Scott" "John Else" ]
 homepage: "https://github.com/xapi-project/ocaml-crc"
 bug-reports: "https://github.com/xapi-project/ocaml-crc/issues"
-dev-repo: "git+https://github.com/xapi-project/ocaml-crc"
-maintainer: "xen-api@lists.xen.org"
-license: "ISC"
-build: [[ "dune" "build" "-p" name ]]
-run-test: [[ "dune" "runtest" "-p" name "-j" jobs ]]
 depends: [
-  "dune"
+  "dune" {>= "1.4"}
   "ocaml" {>= "4.00.1"}
   "cstruct" {>= "1.0.1"}
   "ounit2" {with-test}
@@ -17,7 +15,6 @@ depends: [
   "ppx_deriving_rpc"
   "ppx_sexp_conv" {>= "v0.11.0"}
 ]
-synopsis: "CRC implementation supporting strings and cstructs"
-url {
-  src: "https://github.com/xapi-project/ocaml-crc/archive/master.tar.gz"
-}
+build: [[ "dune" "build" "-p" name ]]
+run-test: [[ "dune" "runtest" "-p" name "-j" jobs ]]
+dev-repo: "git+https://github.com/xapi-project/ocaml-crc"
diff --git a/lib/crc_stubs.c b/lib/crc_stubs.c
index d553e1f..60004d4 100644
--- a/lib/crc_stubs.c
+++ b/lib/crc_stubs.c
@@ -94,7 +94,7 @@ CAMLprim value crc32_cstruct(
 
     unsigned char* data;
 
-    data = (unsigned char*) Data_bigarray_val(buffer);
+    data = (unsigned char*) Caml_ba_data_val(buffer);
     data += Int_val(offset);
 
     result = caml_copy_int32(crc32(Int32_val(crc), data, Int_val(length)));