diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1fc1f458174..f549e571abe 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -27,7 +27,9 @@ with pkgs;
   # Used by wine, firefox with debugging version of Flash, ...
   pkgsi686Linux = forceSystem "i686-linux" "i386";
 
-  callPackage_i686 = pkgsi686Linux.callPackage;
+  callPackage_i686 = if stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux"
+    then pkgsi686Linux.callPackage
+    else throw "callPackage_i686 not supported on system '${stdenv.system}'";
 
   # A stdenv capable of building 32-bit binaries.  On x86_64-linux,
   # it uses GCC compiled with multilib support; on i686-linux, it's