diff --git a/pkgs/development/libraries/opencv/default.nix b/pkgs/development/libraries/opencv/default.nix
index 7dafcfce948..45ac75340b1 100644
--- a/pkgs/development/libraries/opencv/default.nix
+++ b/pkgs/development/libraries/opencv/default.nix
@@ -1,19 +1,19 @@
 { lib, stdenv, fetchurl, cmake, gtk, libjpeg, libpng, libtiff, jasper, ffmpeg
-, pkgconfig, gstreamer, xineLib, glib, python27, python27Packages
+, pkgconfig, gstreamer, xineLib, glib, python27, python27Packages, unzip
 , enableBloat ? false }:
 
-let v = "2.4.7"; in
+let v = "2.4.9"; in
 
 stdenv.mkDerivation rec {
   name = "opencv-${v}";
 
   src = fetchurl {
-    url = "mirror://sourceforge/opencvlibrary/opencv-${v}.tar.gz";
-    sha256 = "0hravl3yhyv4r4n7vb055d4qnp893q2hc0fcmmncfh7sbdrnr3f4";
+    url = "mirror://sourceforge/opencvlibrary/opencv-${v}.zip";
+    sha256 = "0wacpc00dr57w4lxfvllqa177cnbgy2zmcx8pnf8x62lh6210c40";
   };
 
   buildInputs =
-    [ libjpeg libpng libtiff ]
+    [ unzip libjpeg libpng libtiff ]
     ++ lib.optionals enableBloat [ gtk glib jasper ffmpeg xineLib gstreamer python27 python27Packages.numpy ];
 
   nativeBuildInputs = [ cmake pkgconfig ];