diff --git a/pkgs/development/libraries/cloog/default.nix b/pkgs/development/libraries/cloog/default.nix
index 55f705971701..5da29273a8be 100644
--- a/pkgs/development/libraries/cloog/default.nix
+++ b/pkgs/development/libraries/cloog/default.nix
@@ -1,11 +1,11 @@
 { fetchurl, stdenv, gmp, isl }:
 
 stdenv.mkDerivation rec {
-  name = "cloog-0.18.3";
+  name = "cloog-0.18.4";
 
   src = fetchurl {
     url = "http://www.bastoul.net/cloog/pages/download/count.php3?url=./${name}.tar.gz";
-    sha256 = "0d4pqs4rs1qx0302wpv06ww1nwyg4yv5cw9qpfzxz36b19s6q326";
+    sha256 = "03km1aqaiy3sbqc2f046ms9x0mlmacxlvs5rxsvjj8nf20vxynij";
   };
 
   buildInputs = [ gmp ];