diff --git a/nixos/modules/services/hardware/udev.nix b/nixos/modules/services/hardware/udev.nix
index 1dc344a10fce..39180f4d37ec 100644
--- a/nixos/modules/services/hardware/udev.nix
+++ b/nixos/modules/services/hardware/udev.nix
@@ -236,6 +236,8 @@ in
 
     system.activationScripts.udevd =
       ''
+        echo "" > /proc/sys/kernel/hotplug
+
         # Regenerate the hardware database /var/lib/udev/hwdb.bin
         # whenever systemd changes.
         if [ ! -e /var/lib/udev/prev-systemd -o "$(readlink /var/lib/udev/prev-systemd)" != ${config.systemd.package} ]; then
diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 77045a0440c9..c802d3f266df 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -269,9 +269,6 @@ with stdenv.lib;
   SLIP_COMPRESSED y # CSLIP compressed headers
   SLIP_SMART y
   THERMAL_HWMON y # Hardware monitoring support
-  ${optionalString (versionAtLeast version "3.15") ''
-    UEVENT_HELPER n
-  ''}
   USB_DEBUG? n
   USB_EHCI_ROOT_HUB_TT y # Root Hub Transaction Translators
   USB_EHCI_TT_NEWSCHED y # Improved transaction translator scheduling