diff --git a/pkgs/development/libraries/science/math/openblas/default.nix b/pkgs/development/libraries/science/math/openblas/default.nix
index 4d30671c488..5ceedd674f5 100644
--- a/pkgs/development/libraries/science/math/openblas/default.nix
+++ b/pkgs/development/libraries/science/math/openblas/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   cpu = builtins.head (stdenv.lib.splitString "-" stdenv.system);
 
-  target = if cpu == "i686" then "P6" else 
+  target = if cpu == "i686" then "P2" else 
     if cpu == "x86_64" then "CORE2" else
      # allow autodetect
       "";