diff --git a/modules/virtualisation/qemu-vm.nix b/modules/virtualisation/qemu-vm.nix
index 8881cc5304d..93212af2dfc 100644
--- a/modules/virtualisation/qemu-vm.nix
+++ b/modules/virtualisation/qemu-vm.nix
@@ -240,7 +240,7 @@ in
   # CIFS.  Also use paravirtualised network and block devices for
   # performance.
   boot.initrd.availableKernelModules =
-    [ "cifs" "nls_utf8" ]
+    [ "cifs" "nls_utf8" "hmac" "md4" ]
     ++ optional cfg.writableStore [ "aufs" ];
 
   boot.extraModulePackages =