diff --git a/pkgs/development/tools/ocaml/oasis/default.nix b/pkgs/development/tools/ocaml/oasis/default.nix
index a5260b499c4..6c47ade61f6 100644
--- a/pkgs/development/tools/ocaml/oasis/default.nix
+++ b/pkgs/development/tools/ocaml/oasis/default.nix
@@ -2,10 +2,10 @@
  ocamlmod, ocamlify, ounit, expect}:
 
 stdenv.mkDerivation {
-  name = "ocaml-oasis-0.4.1";
+  name = "ocaml-oasis-0.4.4";
 
   src = fetchurl {
-    url = http://forge.ocamlcore.org/frs/download.php/1355/oasis-0.4.1.tar.gz;
+    url = http://forge.ocamlcore.org/frs/download.php/1355/oasis-0.4.4.tar.bz2;
     sha256 = "1lsnw9f1jh6106kphxg40qp0sia6cbkbb9ahs5y6ifnfkmllkjhj";
   };