diff --git a/pkgs/development/libraries/libav/default.nix b/pkgs/development/libraries/libav/default.nix
index 785e3599bf1..3d4fbab3e42 100644
--- a/pkgs/development/libraries/libav/default.nix
+++ b/pkgs/development/libraries/libav/default.nix
@@ -13,6 +13,7 @@
 , SDL # only for avplay in $bin, adds nontrivial closure to it
 , enableGPL ? true # ToDo: some additional default stuff may need GPL
 , enableUnfree ? faacSupport
+, hostPlatform
 }:
 
 assert faacSupport -> enableUnfree;
@@ -107,10 +108,10 @@ let
     crossAttrs = {
       configurePlatforms = [];
       configureFlags = configureFlags ++ [
-        "--cross-prefix=${stdenv.cross.config}-"
+        "--cross-prefix=${stdenv.cc.prefix}"
         "--enable-cross-compile"
         "--target_os=linux"
-        "--arch=${stdenv.cross.arch}"
+        "--arch=${hostPlatform.arch}"
         ];
     };