diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index fa7107bd738..7ac1b2cc519 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -2,7 +2,7 @@
 , kernel ? pkgs.linux
 , img ? "bzImage"
 , rootModules ?
-    [ "virtio_pci" "virtio_blk" "virtio_balloon" "ext4" "unix" "9p" "9pnet_virtio" "rtc_cmos" ]
+    [ "virtio_pci" "virtio_blk" "virtio_balloon" "virtio_rng" "ext4" "unix" "9p" "9pnet_virtio" "rtc_cmos" ]
 }:
 
 with pkgs;
@@ -218,6 +218,7 @@ rec {
     ${qemuProg} \
       ${lib.optionalString (pkgs.stdenv.system == "x86_64-linux") "-cpu kvm64"} \
       -nographic -no-reboot \
+      -device virtio-rng-pci \
       -virtfs local,path=/nix/store,security_model=none,mount_tag=store \
       -virtfs local,path=$TMPDIR/xchg,security_model=none,mount_tag=xchg \
       -drive file=$diskImage,if=virtio,cache=unsafe,werror=report \