diff --git a/pkgs/os-specific/linux/kernel/linux-3.5.nix b/pkgs/os-specific/linux/kernel/linux-3.5.nix
index 42456a8bdd9..afcf73e0e35 100644
--- a/pkgs/os-specific/linux/kernel/linux-3.5.nix
+++ b/pkgs/os-specific/linux/kernel/linux-3.5.nix
@@ -258,6 +258,7 @@ import ./generic.nix (
     features.iwlwifi = true;
     features.efiBootStub = true;
     features.needsCifsUtils = true;
+    features.canDisableNetfilterConntrackHelpers = true;
     features.netfilterRPFilter = true;
   }
 
diff --git a/pkgs/os-specific/linux/kernel/linux-3.6.nix b/pkgs/os-specific/linux/kernel/linux-3.6.nix
index 66ca30a839c..463833df358 100644
--- a/pkgs/os-specific/linux/kernel/linux-3.6.nix
+++ b/pkgs/os-specific/linux/kernel/linux-3.6.nix
@@ -262,6 +262,7 @@ import ./generic.nix (
     features.iwlwifi = true;
     features.efiBootStub = true;
     features.needsCifsUtils = true;
+    features.canDisableNetfilterConntrackHelpers = true;
     features.netfilterRPFilter = true;
   }