diff --git a/pkgs/os-specific/linux/kernel/linux-chromiumos-3.14.nix b/pkgs/os-specific/linux/kernel/linux-chromiumos-3.14.nix
index fb52b14c9ae3..d781a5b96855 100644
--- a/pkgs/os-specific/linux/kernel/linux-chromiumos-3.14.nix
+++ b/pkgs/os-specific/linux/kernel/linux-chromiumos-3.14.nix
@@ -1,5 +1,8 @@
 { stdenv, fetchgit, perl, buildLinux, ncurses, openssh, ... } @ args:
 
+# ChromiumOS requires a 64bit build host
+assert stdenv.is64bit;
+
 import ./generic.nix (args // rec {
   version = "3.14.0";
   extraMeta.branch = "3.14";
diff --git a/pkgs/os-specific/linux/kernel/linux-chromiumos-3.18.nix b/pkgs/os-specific/linux/kernel/linux-chromiumos-3.18.nix
index 9ab3f70c97fc..fc0997eabdd7 100644
--- a/pkgs/os-specific/linux/kernel/linux-chromiumos-3.18.nix
+++ b/pkgs/os-specific/linux/kernel/linux-chromiumos-3.18.nix
@@ -1,5 +1,8 @@
 { stdenv, fetchgit, perl, buildLinux, ncurses, ... } @ args:
 
+# ChromiumOS requires a 64bit build host
+assert stdenv.is64bit;
+
 import ./generic.nix (args // rec {
   version = "3.18.0";
   extraMeta.branch = "3.18";