diff --git a/pkgs/development/libraries/openmpi/default.nix b/pkgs/development/libraries/openmpi/default.nix
index c98249e89c4d..345dffa87f5b 100644
--- a/pkgs/development/libraries/openmpi/default.nix
+++ b/pkgs/development/libraries/openmpi/default.nix
@@ -9,14 +9,13 @@
 }:
 
 let
-  majorVersion = "3.1";
-  minorVersion = "3";
+  version = "3.1.3";
 
 in stdenv.mkDerivation rec {
-  name = "openmpi-${majorVersion}.${minorVersion}";
+  name = "openmpi-${version}";
 
-  src = fetchurl {
-    url = "http://www.open-mpi.org/software/ompi/v${majorVersion}/downloads/${name}.tar.bz2";
+  src = with stdenv.lib.versions; fetchurl {
+    url = "http://www.open-mpi.org/software/ompi/v${major version}.${minor version}/downloads/${name}.tar.bz2";
     sha256 = "1dks11scivgaskjs5955y9wprsl12wr3gn5r7wfl0l8gq03l7q4b";
   };