diff --git a/modules/system/boot/stage-1-init.sh b/modules/system/boot/stage-1-init.sh
index 68e0f7feec1..d47ce1caffd 100644
--- a/modules/system/boot/stage-1-init.sh
+++ b/modules/system/boot/stage-1-init.sh
@@ -123,6 +123,11 @@ udevadm trigger --action=add
 udevadm settle
 udevadm control --env=STARTUP=
 
+
+# XXX: Use case usb->lvm will still fail, usb->luks->lvm is covered
+@preLVMCommands@
+
+
 echo "starting device mapper and LVM..."
 lvm vgscan
 lvm vgchange -ay
diff --git a/modules/system/boot/stage-1.nix b/modules/system/boot/stage-1.nix
index 185ca1cb516..e178f2c04c9 100644
--- a/modules/system/boot/stage-1.nix
+++ b/modules/system/boot/stage-1.nix
@@ -35,6 +35,14 @@ let
       '';
     };
 
+    boot.initrd.preLVMCommands = mkOption {
+      default = "";
+      merge = mergeStringOption;
+      description = ''
+        Shell commands to be executed immediately before lvm discovery.
+      '';
+    };
+
     boot.initrd.postDeviceCommands = mkOption {
       default = "";
       merge = mergeStringOption;
@@ -304,7 +312,7 @@ let
     inherit (config.boot) resumeDevice devSize runSize;
 
     inherit (config.boot.initrd) checkJournalingFS
-      postDeviceCommands postMountCommands kernelModules;
+      preLVMCommands postDeviceCommands postMountCommands kernelModules;
 
     # !!! copy&pasted from upstart-jobs/filesystems.nix.
     mountPoints =